Michigan Democrat Abdul El-Sayed’s former opponent in the U.S. Senate primary, Haley Stevens, stunned party officials Sunday by endorsing Republican Mike Rogers after Democratic tensions boiled over days before the election that could determine the balance of power on Capitol Hill.

Stevens endorsed Rogers after attending a Detroit church service with him. The remarkable show of support for Donald Trump’s backed candidate in the tightly contested race comes after she was uninvited to a joint event the same day with El-Sayed, who defeated the congresswoman by a slim margin in the August primary.

“Our Democratic nominee for Senate said I was no longer welcome in his campaign and that I should stay away,” Stevens said video announcing the endorsement. “And he’s right. And that’s why I am endorsing Mike Rogers for the United States Senate today.”

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.

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.