What to know about Trump fixer-turned-foe Michael Cohen's trial testimony

Once Donald Trump's loyal attorney and fixer, Michael Cohen pointed the finger at his former boss Monday in pivotal testimony about hush money payments at the center of the first criminal trial of a former American president.

Cohen provided jurors with an insider's account of payments to silence women's claims of sexual encounters with Trump, saying the payments were directed by Trump to fend off damage to his 2016 White House bid.

Cohen is expected to be on the witness stand for several days, and face intense grilling by Trump's attorneys, who have painted him as a liar who's trying to take down the presumptive Republican presidential nominee.

While prosecutors' most important witness, he's also their most vulnerable to attack — having served time in federal prison and built his persona in recent years around being a thorn in Trump's side.

Trump has denied any wrongdoing in the case.

Here are some takeaways from Cohen's testimony so far: