How to flip a witness, as explained by a former federal prosecutor

Michael Cohen certainly seems like a guy who’s ready to turn on his old boss.

Last week, Cohen’s attorney, Lanny Davis, gave CNN a tape of Donald Trump and Cohen discussing a payment to former Playboy Playmate Karen McDougal in September 2016. The recording confirmed Trump was aware of the payoff at the time.

Just a few days later, sources told CNN that Cohen was willing to tell special counsel Robert Mueller that Trump knew in advance about the 2016 Trump Tower meeting, where Russians offered campaign “dirt” on then-candidate Hillary Clinton. Trump has repeatedly denied knowing about that meeting.

It was a stunning turn for Trump’s former attorney and fixer, who once said he would take a bullet for the president. The revelations came after months of speculation as to whether Cohen — who’s under federal investigation and appears to be in serious legal jeopardy — would “flip” on the president, striking a deal with prosecutors and spilling what he knows about Trump’s business dealings, the campaign’s ties to Russia,

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