Vermont Sen. Bernie Sanders and the leader of “the Squad” are reportedly not seeing eye to eye on the campaign trail.

New York Rep. Alexandria Ocasio-Cortez is reportedly frustrating the Sanders campaign during her appearances at the socialist’s campaign rallies. While Sanders was occupied in the Senate during the impeachment trial of President Trump, AOC subbed in for him. However, she did not mention the candidate by name during a January rally, though she endorsed him last October.