Jim Messina called out Congresswoman Alexandria Ocasio-Cortez on Tuesday, criticizing her for backing progressives over incumbents in Democratic primaries and arguing that “dumb s***” like that could ultimately cost the party.

Messina, who served as the 2012 campaign manager for former President Barack Obama, was responding to the news that Ocasio-Cortez was endorsing Alessandra Biaggi in her race to unseat Democratic Congressional Campaign Committee chair Sean Patrick Maloney.

“This is so counter-productive,” Messina tweeted. “The Supreme Court is about to outlaw abortion. We could lose both houses. So we are going to focus our time running against each other? Now we’re primarying committed progressives because … why? If we lose house it’s because of dumb s*** like this.”