The GOP is largely sticking by Trump, but they're calling him out on the withdrawal of troops in Syria. Meanwhile, Joe Biden is calling for Trump's impeachment and two Giuliani associates have been arrested for their roles in the Ukraine scandal. CNN political director David Chalian talks over the latest impeachment developments with CNN's chief political correspondent, Dana Bash. Dan Caldwell, a Distinguished Professor of Political Science at Pepperdine University, provides historical perspective and explains how the impeachment inquiry impacts international relations.