Lev Parnas, an associate of Trump lawyer Rudy Giuliani, says President Trump is lying when he says he doesn't know him. Parnas has turned over texts that imply an effort by Trump backers to spy on U.S. ambassador Marie Yovanovitch in Ukraine. All this unfolded as the Senate prepares for the impeachment trial. CBS News chief congressional correspondent Nancy Cordes and producer Rebecca Kaplan have the latest from Capitol Hill.
