In a nutshell, he was trying to rig the 2020 election

Faced with the revelation of his actions, President Trump publicly and repeatedly persisted in urging foreign governments, including Ukraine and China, to investigate his political opponent.  This continued solicitation of foreign interference in a U.S. election presents a clear and present danger that the President will continue to use the power of his office for his personal political gain. --- The House Intelligence Committee impeachment report,  released today:

The impeachment inquiry into Donald J. Trump, the 45th President of the United States, uncovered a months-long effort by President Trump to use the powers of his office to solicit foreign interference on his behalf in the 2020 election.  As described in this executive summary and the report that follows, President Trump’s scheme subverted U.S. foreign policy toward Ukraine and undermined our national security in favor of two politically motivated investigations that would help his presidential reelection campaign.  The President demanded that the newly-elected Ukrainian president, Volodymyr Zelensky, publicly announce investigations into a political rival that he apparently feared the most, former Vice President Joe Biden, and into a discredited theory that it was Ukraine, not Russia, that interfered in the 2016 presidential election.  To compel the Ukrainian President to do his political bidding, President Trump conditioned two official acts on the public announcement of the investigations:  a coveted White House visit and critical U.S. military assistance Ukraine needed to fight its Russian adversary.

During a July 25, 2019, call between President Trump and President Zelensky, President Zelensky expressed gratitude for U.S. military assistance.  President Trump immediately responded by asking President Zelensky to “do us a favor though” and openly pressed for Ukraine to investigate former Vice President Biden and the 2016 conspiracy theory.  In turn, President Zelensky assured President Trump that he would pursue the investigation and reiterated his interest in the White House meeting.  Although President Trump’s scheme intentionally bypassed many career personnel, it was undertaken with the knowledge and approval of senior Administration officials, including the President’s Acting Chief of Staff Mick Mulvaney, Secretary of State Mike Pompeo, and Secretary of Energy Rick Perry.  In fact, at a press conference weeks after public revelations about the scheme, Mr. Mulvaney publicly acknowledged that the President directly tied the hold on military aid to his desire to get Ukraine to conduct a political investigation, telling Americans to “get over it.”   

President Trump and his senior officials may see nothing wrong with using the power of the Office of the President to pressure a foreign country to help the President’s reelection campaign.  Indeed, President Trump continues to encourage Ukraine and other foreign countries to engage in the same kind of election interference today.  However, the Founding Fathers prescribed a remedy for a chief executive who places his personal interests above those of the country:  impeachment.  Accordingly, as part of the House of Representatives’ impeachment inquiry, the Permanent Select Committee on Intelligence, in coordination with the Committees on Oversight and Reform and Foreign Affairs, were compelled to undertake a serious, sober, and expeditious investigation into whether the President’s misconduct warrants that remedy.

In response, President Trump engaged in an unprecedented campaign of obstruction of this impeachment inquiry.  Nevertheless, due in large measure to patriotic and courageous public servants who provided the Committees with direct evidence of the President’s actions, the Committees uncovered significant misconduct on the part of the President of the United States.  As required under House Resolution 660, the Intelligence Committee, in consultation with the Committees on Oversight and Reform and Foreign Affairs, has prepared this report to detail the evidence uncovered to date, which will now be transmitted to the Judiciary Committee for its consideration.

Based on witness testimony and evidence collected during the impeachment inquiry, the Committees released the following findings:

I. Donald J. Trump, the 45th President of the United States—acting personally and through his agents within and outside of the U.S. government—solicited the interference of a foreign government, Ukraine, in the 2020 U.S. presidential election. The President engaged in this course of conduct for the benefit of his reelection, to harm the election prospects of a political opponent, and to influence our nation’s upcoming presidential election to his advantage. In so doing, the President placed his personal political interests above the national interests of the United States, sought to undermine the integrity of the U.S. presidential election process, and endangered U.S. national security.

II. In furtherance of this scheme, President Trump—directly and acting through his agents within and outside the U.S. government—sought to pressure and induce Ukraine’s newly-elected president, Volodymyr Zelensky, to publicly announce unfounded investigations that would benefit President Trump’s personal political interests and reelection effort. To advance his personal political objectives, President Trump encouraged the President of Ukraine to work with his personal attorney, Rudy Giuliani.

III. As part of this scheme, President Trump, acting in his official capacity and using his position of public trust, personally and directly requested from the President of Ukraine that the government of Ukraine publicly announce investigations into (1) the President’s political opponent, former Vice President Joseph R. Biden, Jr. and his son, Hunter Biden, and (2) a baseless theory promoted by Russia alleging that Ukraine—rather than Russia—interfered in the 2016 U.S. election. These investigations were intended to harm a potential political opponent of President Trump and benefit the President’s domestic political standing.

IV. President Trump ordered the suspension of $391 million in vital military assistance urgently needed by Ukraine, a strategic partner, to resist Russian aggression. Because the aid was appropriated by Congress, on a bipartisan basis, and signed into law by the President, its expenditure was required by law. Acting directly and through his subordinates within the U.S. government, the President withheld from Ukraine this military assistance without any legitimate foreign policy, national security, or anti-corruption justification. The President did so despite the longstanding bipartisan support of Congress, uniform support across federal departments and agencies for the provision to Ukraine of the military assistance, and his obligations under the Impoundment Control Act.

V. President Trump used the power of the Office of the President and exercised his authority over the Executive Branch, including his control of the instruments of the federal government, to apply increasing pressure on the President of Ukraine and the Ukrainian government to announce the politically-motivated investigations desired by President Trump. Specifically, to advance and promote his scheme, the President withheld official acts of value to Ukraine and conditioned their fulfillment on actions by Ukraine that would benefit his personal political interests:

President Trump—acting through agents within and outside the U.S. government—conditioned a head of state meeting at the White House, which the President of Ukraine desperately sought to demonstrate continued United States support for Ukraine in the face of Russian aggression, on Ukraine publicly announcing the investigations that President Trump believed would aid his reelection campaign.

To increase leverage over the President of Ukraine, President Trump, acting through his agents and subordinates, conditioned release of the vital military assistance he had suspended to Ukraine on the President of Ukraine’s public announcement of the investigations that President Trump sought.

President Trump’s closest subordinates and advisors within the Executive Branch, including Acting Chief of Staff Mick Mulvaney, Secretary of State Mike Pompeo, Secretary of Energy J. Richard Perry, and other senior White House and Executive Branch officials had knowledge of, in some cases facilitated and furthered the President’s scheme, and withheld information about the scheme from the Congress and the American public.

VI. In directing and orchestrating this scheme to advance his personal political interests, President Trump did not implement, promote, or advance U.S. anti-corruption policies. In fact, the President sought to pressure and induce the government of Ukraine to announce politically-motivated investigations lacking legitimate predication that the U.S. government otherwise discourages and opposes as a matter of policy in that country and around the world. In so doing, the President undermined U.S. policy supporting anti-corruption reform and the rule of law in Ukraine, and undermined U.S. national security.

VII. By withholding vital military assistance and diplomatic support from a strategic foreign partner government engaged in an ongoing military conflict illegally instigated by Russia, President Trump compromised national security to advance his personal political interests.

VIII. Faced with the revelation of his actions, President Trump publicly and repeatedly persisted in urging foreign governments, including Ukraine and China, to investigate his political opponent. This continued solicitation of foreign interference in a U.S. election presents a clear and present danger that the President will continue to use the power of his office for his personal political gain.

IX. Using the power of the Office of the President, and exercising his authority over the Executive Branch, President Trump ordered and implemented a campaign to conceal his conduct from the public and frustrate and obstruct the House of Representatives’ impeachment inquiry by:

refusing to produce to the impeachment inquiry’s investigating Committees information and records in the possession of the White House, in defiance of a lawful subpoena; 

directing Executive Branch agencies to defy lawful subpoenas and withhold the production of all documents and records from the investigating Committees; 

directing current and former Executive Branch officials not to cooperate with the Committees, including in defiance of lawful subpoenas for testimony; 

and intimidating, threatening, and tampering with prospective and actual witnesses in the impeachment inquiry in an effort to prevent, delay, or influence the testimony of those witnesses.

In so doing, and despite the fact that the Constitution vests in the House of Representatives the “sole Power of Impeachment,” the President sought to arrogate to himself the right to determine the propriety, scope, and nature of an impeachment inquiry into his own misconduct, and the right to deny any and all information to the Congress in the conduct of its constitutional responsibilities.