Republican Rep. Liz Cheney has endorsed Democrat Rep. Elissa Slotkin in Slotkin's reelection campaign in Michigan's 7th District.

Cheney has been at odds with a significant portion of her own party as a vocal critic of former President Donald Trump and a member of the Democrat-led January 6 committee, but this is the first time she has crossed the aisle and thrown her support behind a Democrat in the midterm elections.  In a statement posted on Slotkin's campaign website, Cheney praised Slotkin's character while noting their political differences.

"I’m proud to endorse Elissa Slotkin. Serving together on the Armed Services Committee, I have come to know Elissa as a good and honorable public servant who works hard for the people she represents, wants what’s best for the country, and is in this for the right reasons," Cheney said. "While Elissa and I have our policy disagreements, at a time when our nation is facing threats at home and abroad, we need serious, responsible, substantive members like Elissa in Congress."

Slotkin said she is "grateful" for Cheney's support, even though they "certainly don’t agree on every issue."

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Liz Cheney at Jan. 6 hearing

Vice Chair Liz Cheney speaks at a hearing of the House select committee investigating the Jan. 6 attack at the Capitol, June 28, 2022. (AP Photo/J. Scott Applewhite, File)

The Slotkin campaign announced that Cheney will be joining the Democratic congresswoman at an event in Michigan with a theme of "Patriotism and Bipartisanship" on Nov. 1.

"I look forward to welcoming her to Michigan’s 7th District next week to discuss the points where all Americans can leave politics aside and put our country above all else.," Slotkin said.

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Elissa Slotkin

Rep. Elissa Slotkin speaks during a news conference in Washington on May 13, 2021. (Caroline Brehman/CQ-Roll Call, Inc via Getty Images)

Slotkin is running against Republican state Sen. Tom Barrett in a race the Fox News Power Rankings rate as a toss-up.

Cheney will lose her seat at the end of the year after losing her district's Republican primary to Harriet Hageman earlier this year.

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The Wyoming Republican said she will officially leave the GOP if Trump is the party's presidential nominee in 2024.

The Associated Press contributed to this report.