Senator John Fetterman has signaled that he could reach a breaking point with the Democratic Party if Senator Chris Van Hollen is elected to Senate majority leader.

Fetterman, who has repeatedly clashed with members of his own party over Israel, suggested that Van Hollen’s potential leadership appointment would be troubling because of his criticism of the Israeli government.

Asked by Kayleigh McEnany during a Fox News interview on Saturday whether Van Hollen becoming majority leader would represent a red line that could prompt him to leave the Democratic Party, Fetterman responded: “Yeah, absolutely, it would be troubling if my caucus elects someone like Van Hollen, that has really made his name being very…hostile to Israel.”