Michael Cohen, Donald Trump's former lawyer, and personal "fixer," is set to be the star prosecution witness in Trump's ongoing hush money trial in New York. Cohen is expected to testify this week about his role in arranging hush money payments to Stormy Daniels and others during Trump's 2016 presidential campaign. Prosecutors say the payments were meant to prevent allegations of sexual encounters with Trump from becoming public before the election. Cohen has pleaded guilty previously to charges related to the payments and lying to Congress about Trump's plans for a Moscow real estate project.