(CNN) — More than two dozen former Republican lawmakers announced Monday they are endorsing Joe Biden for president.

Former Sen. Jeff Flake of Arizona and former Rep. Charlie Dent of Pennsylvania are among those throwing their support behind the Democratic presidential nominee through “Republicans for Biden,” and the endorsements come on the morning of the first day of the Republican National Convention.

Biden has repeatedly emphasized Republican support as he looks to build a broad coalition in his campaign against President Donald Trump.

Trump campaign spokesman Tim Murtaugh dismissed the significance of the endorsement.

“Joe Biden has been a failure in the Washington Swamp for a half century, so no one should be surprised when Swamp creatures gather to protect one of their own,” Murtaugh said. “President Trump has unprecedented support — over 95 percent — among real Republican voters and is also making strong inroads in Biden’s core Democrat constituencies, like Black Americans, Latinos, and union members. President Trump’s record of success for all Americans will carry him to victory in November.”

This story is breaking and will be updated.

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