Sen. John Fetterman bluntly warned on Thursday that he would leave the Democratic Party if it adopts an anti-Israel policy — one of his most direct threats yet amid the first-term Pennsylvanian’s intensifying battle with progressives over the direction of their party.

Fetterman is known as a maverick in the Democratic Party, sticking to traditional positions on immigration, foreign policy, and more.

The Pennsylvania senator, whom Republicans have courted, said he’d bail if Democrats become “the anti-Israel party.”