Lawyers for former President Donald Trump, during his New York hush money trial on Thursday, challenged Trump’s former lawyer Michael Cohen over Cohen’s past lies in sworn testimony — casting the prosecution’s witness as a serial liar.

Trump lawyer Todd Blanche spent the better part of the 18th day of the trial working to paint a picture for the 12-member jury of Cohen as a proven liar who pleaded guilty to crimes associated with those lies and used his cooperation as part of those pleas to obtain a shorter prison sentence. Cohen was measured at first, but courtroom reporters noted that he began to get animated under cross-examination on Thursday.