For Republican supporters of Donald J. Trump in Michigan, it seemed like a crowning moment: The state party chose two candidates endorsed by the former president, both outspoken preachers of 2020 election falsehoods, as its contenders for the state’s top law enforcement officer and its chief of election administration.
But instead, that move at a convention last weekend — where Republicans officially endorsed Matthew DePerno for attorney general and Kristina Karamo for secretary of state — has ruptured the Michigan Republican Party. After months of strain, it appears to finally be snapping as what remains of the old guard protests the party’s direction.
This week, Tony Daunt, a powerful figure in Michigan politics with close ties to the influential donor network of the DeVos family, resigned from the G.O.P.’s state committee in a blistering letter, calling Mr. Trump “a deranged narcissist.” Major donors to the state party indicated that they would direct their money elsewhere. And one of Mr. Trump’s most loyal defenders in the State Legislature was kicked out of the House Republican caucus.
The repudiation of the election-denying wing of the party by other Republicans in Michigan represents rare public pushback from conservatives against Mr. Trump’s attempts to force candidates across the country to support his claims of a rigged 2020 vote. That stance has become a litmus test for G.O.P. politicians up and down the ballot as Mr. Trump adds to his slate of more than 150 endorsements this election cycle.