DETROIT (AP) — Michigan Democrats are heading to church in Detroit on Sunday in an attempt to present a united front behind Abdul El-Sayed in a race that could decide control of the U.S. Senate. But one prominent Democrat is expected to be missing from the pews.

U.S. Rep. Haley Stevens, who lost in the primary to El-Sayed, was initially set to join the nominee and U.S. Rep. Jim Clyburn of South Carolina at a church event. Those plans unraveled after a dispute over Israel and an outside group’s campaign advertisement escalated into a public exchange of criticism between the rivals.

Debbie Dingell, the Michigan congresswoman who helped organize the planned joint appearance in hopes of bringing together Democrats in the final days before Tuesday’s vote, said she asked Stevens not to attend and that Stevens told her she would abide by that.