Kelli Ward, the chairwoman of the Arizona Republican Party, and Kelly Townsend, a state senator, were both said to have expressed concerns to Mr. Trump’s lawyers in December 2020 about participating in a plan to sign on to a slate of electors claiming that Mr. Trump had won Arizona, even though Joseph R. Biden Jr. had won the state.

The scheme was part of a broader bid — one of the longest running and most complicated that Mr. Trump undertook as he sought to cling to power after losing the 2020 presidential election — to falsely manufacture a victory for him by creating fake slates of electors in battleground states who would claim that he had been the true winner.

Some of the lawyers who undertook the effort doubted its legality, and the emails, which have not been previously reported, were the latest indication that other key players also knew they were on shaky legal ground, and took pains to fabricate a rationale that could justify their actions…

“Ward and Townsend are concerned it could appear treasonous for the AZ electors to vote on Monday if there is no pending court proceeding that might, eventually, lead to the electors being ratified as the legitimate ones,” Mr. Chesebro wrote to the group, which included Rudolph W. Giuliani, Mr. Trump’s personal lawyer.