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"I’m supporting Marco Rubio for president because he has the ideas, the principles, and the toughness necessary to bring reform to Washington," Jeff Flake said. | AP Photo Jeff Flake endorses Marco Rubio

Marco Rubio scored yet another congressional Republican endorsement on Monday afternoon, this time from Arizona Sen. Jeff Flake, a fellow member of the 2013 Gang of Eight immigration talks.

"I’m supporting Marco Rubio for president because he has the ideas, the principles, and the toughness necessary to bring reform to Washington," Flake said in a statement released by Rubio's campaign. "In an election where serious solutions are seriously lacking, Marco Rubio has proven that he can inspire more than just anger in Americans who are looking for an alternative to the status quo."

Rubio backed away from the bill in 2013 after support for it stalled in the Republican-controlled House, an issue that has repeatedly surfaced throughout the campaign.

The support comes after Flake set himself in direct opposition to Rubio late last year by urging Senate Majority Leader Mitch McConnell to hold a vote to confirm President Barack Obama's pick to be the next ambassador to Mexico. Members of both parties had said Rubio was stymieing the quick confirmation of Roberta Jacobson because of her work on reestablishing relations with Cuba.