More than 100 Republican officials around the country, including two members of Congress, have asked Republican National Committee chairman Reince Priebus to cut funding for Donald Trump's struggling presidential campaign and redirect that money to protecting vulnerable lawmakers.

"Only swift and decisive action can save the Republican Party and protect the hundreds of other GOP candidates running for office," the 122 Republicans wrote in an open letter to Priebus. "We urge the RNC to immediately halt all support for Donald Trump and invest its resources in a real and winnable campaign to save the Republican Senate and House."

Senate Republicans expected a series of difficult races this fall, given that seven incumbent Republicans are running for reelection in states that President Obama won in 2012. But Trump's poll numbers have sagged over the last month in key states, and the senators' numbers have followed him down.

"This should not be a difficult decision, as Donald Trump's chances of being elected president are evaporating by the day," the Republicans wrote.

The letter has been expected for days, but it features dozens more signatories than originally anticipated. Two sitting House Republicans — retiring Rep. Reid Ribble, R-Wis., and Representative Scott Rigell, R-Va., — also signed the letter.

Rigell was one of the 12 lawmakers who voted against John Boehner continuing as House speaker in a failed coup attempt last year. Ribble was a member of the House Freedom Caucus that successfully maneuvered to oust Boehner in the fall, although Ribble resigned from the caucus in protest after Boehner stepped down.

"Rather than throwing good money after bad, the RNC should shift its strategy and its resources to convince voters not to give Hillary Clinton the "blank check" of a Democrat- controlled Congress to advance her big government agenda," the letter said.