On Monday's broadcast of "CNN Newsroom," Rep. Seth Moulton (D-MA) said he would support an investigation of the withdrawal from Afghanistan that House Republicans have pledged to hold and it's important to do so "because so many Americans have forgotten about the fact that we did leave a lot of Afghans behind." Moulton also argued that the investigation should be of the whole war, and there is responsibility to go around among all four presidents who presided over the war.