Think Progress reminds us what Obama tried to do and who thwarted him:
From CNN:
Trump was personally warned in August 2016 by senior US intelligence officials that foreign adversaries — including Russia — would likely attempt to infiltrate his team or gather intelligence about his campaign, according to sources familiar with the matter.
The security briefing included information about potential interference by foreign actors, including Russia, according to sources familiar with a memo that detailed the August 2016 briefing…
Trump was also told that the Russian government was trying to meddle in the election and that Russia played a direct role in hacks against the Democratic National Committee, NBC News reported in October 2016. Internal DNC emails were published by WikiLeaks about one month before Trump received the briefing.
Trump’s tweet bashing Obama also overlooks that Obama wanted to issue a bipartisan statement in the summer of 2016 detailing what the intelligence community knew about Russian meddling and offering federal help to states. But his effort was stymied by Senate Majority Leader Mitch McConnell (R-KY), who expressed “skepticism that the underlying intelligence truly supported the White House’s claims” about Russia interference, the Washington Post reported. McConnell ultimately blocked the release of a statement.