Former President Donald J. Trump suggested without evidence on Saturday that Georgia’s Republican governor was hampering his efforts to win the battleground state in November, a claim that carried echoes of Mr. Trump’s attempt to overturn his defeat to President Biden there in 2020.

“In my opinion, they want us to lose,” Mr. Trump said, accusing the state’s governor, Brian Kemp, and its secretary of state, Brad Raffensperger, who is also a Republican, of being disloyal and trying to make life difficult for him.

At a rally at the Georgia State University Convocation Center in Atlanta, in a speech that lasted more than 90 minutes and that was peppered with grievances about his loss four years ago, Mr. Trump falsely claimed, “I won this state twice,” referring to the 2016 and 2020 elections.

Mr. Trump lost to Mr. Biden by roughly 12,000 votes in Georgia in 2020. Last year, the former president was indicted by an Atlanta grand jury on charges related to his efforts to subvert the results of that election in that state. On Saturday, he complained that he might have avoided legal jeopardy if Mr. Kemp and Mr. Raffensperger had cooperated with his attempts to reverse the 2020 results.

Mr. Trump added that he thought Georgia had slipped under Mr. Kemp’s leadership. “The state has gone to hell,” he said.

Representatives for Mr. Kemp, who indicated in June that he had not voted for Mr. Trump in the Republican primary this year, and Mr. Raffensperger did not immediately respond to requests for comment.