What did Obama know, and when did he know it?

In an article at The Nation entitled Russiagate or Intelgate?, Stephen Cohen asks,

What was President Obama’s role in any of this? Or to resort to the Watergate question: What did he know and when did he know it? And what did he do? The same questions would need to be asked about his White House aides and other appointees. Whatever the full answers, there is no doubt that Obama acted on the Russiagate allegations. He cited them for the sanctions he imposed on Russia in December 2016, which led directly to the case of General Michael Flynn (not for doing anything wrong with Russia but for “lying to the FBI”); to the worsening of the new US-Russian Cold War; and thus to the perilous relationship inherited by President Trump, who has in turn been thwarted by Russiagate in his attempts to improve relations through “cooperation” with Putin.

Read more here.