Could The President Have Obstructed Justice Without Committing A Crime?

Attorney General William Barr concluded that President Trump did not obstruct justice due to lack of evidence to prove that he committed an underlying crime. Does one have to commit a crime to obstruct justice and is it possible that a sitting president can be indicted? Here & Now's Jeremy Hobson talks with Bloomberg opinion columnist and Harvard University law professor Noah Feldman (@NoahRFeldman).