Sen. Bernie Sanders, I-Vt., joined Stephen Colbert on “The Late Show” Thursday night where the host couldn’t resist asking him to comment on recently released excerpts from Hillary Clinton’s book that reflect on their primary battle.

Though Clinton’s words for the senator were so harsh they turned heads this week, Sanders did not reciprocate, choosing instead to stay positive and argue it’s time to move forward from 2016. He did, however, level one choice dig at his former opponent.