By Luc Cohen and Jack Queen

NEW YORK, May 15 (Reuters) -

Donald Trump's former lawyer Michael Cohen testified at the former U.S. president's criminal trial this week, asserting he had Trump's "signoff" to buy a porn star's silence and undergoing a cross-examination by Trump's lawyers.

Trump has pleaded not guilty to falsifying business records to cover up Cohen's $130,000 payment to adult film star Stormy Daniels before the 2016 election about a sexual encounter she says they had in 2006. Trump denies an encounter.

Defense lawyer Todd Blanche is expected to resume cross-examining Cohen, the star prosecution witness, on Thursday. Here are five milestones from Cohen's testimony so far: