Why Seth Moulton thinks impeachment is the right thing to do

Rep. Seth Moulton, D-Mass., is a former Marine who served four tours of duty in Iraq. Now a candidate for the 2020 Democratic presidential nomination, he's emphasizing his military service and national security credentials as he faces off against other Democrats. Moulton joins Judy Woodruff to discuss “doing the right thing” on impeachment and why calling the president names is a “waste of time.”