Andres Kudacki/AP
- Michael Cohen was one of Donald Trump's closest associates for years.
- Trump's former "fixer" is now a key witness in the former president's historic criminal trial.
- "What I was doing, I was doing at the direction of and benefit of Mr. Trump," Cohen testified.
Michael Cohen was once so loyal to former President Donald Trump that he vowed "to take a bullet" for him. He's now one of the marquee witnesses in Trump's history-making Manhattan criminal trial.