Cheney supported Slotkin in her race against the Republican state senator who questioned the legitimacy of the election.
According to a statement released by Slotkin's campaign, Cheney acknowledged their policy differences and urged Republicans to vote for her.
The endorsement is Cheney's first as a Democrat and follows her high profile role as one of two Republicans on the January 6 committee, in which she leveled strong criticism against Trump.
Slotkin, in a toss-up race for re-election against Barrett, has publicly disputed Republicans' claims of fraud in the 2020 presidential election and spoken out against Trump.
Both Cheney and Slotkin criticized Republicans who denied the outcome of the 2020 presidential election when they served on the House armed services committee.
On January 5, 2021, 11 members of the Michigan state Senate wrote a letter to Congress asking for an investigation into the 2020 presidential election.
Cheney lost her seat in Congress when the former president endorsed Hageman, but she has expressed no regrets. She said after her primary loss that she could run for president in four years.
There is a limit to the number of items that can be put together. The number of seats Republicans are likely to win on election day, according to FiveThirtyEight, which gives the GOP an 80% chance of taking control of the House. Slotkin's seat is one of 23 held by Democrats that are considered toss-ups.
At a time when our nation is facing threats at home and abroad, we need serious, responsible, substantive members.
On Tuesday, Cheney and Slotkin will be campaigning.
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Liz Cheney lost her seat to a Trump-backed candidate.