A Senate Republican is standing up for a GOP colleague in his contentious reelection bid, despite opposition from President Trump.

Sen. Joni Ernst Joni Kay ErnstGraham: GOP will confirm Trump's Supreme Court nominee before the election Joe Biden looks to expand election battleground into Trump country Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee MORE (R-Iowa) will speak at a Phoenix fundraiser for Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.) in support of the senator's reelection campaign against a pro-Trump challenger, according to azcentral.com.

Ernst will appear at a Young Republicans meet-and-greet event on Sept. 7, followed by a "Women for Flake" fundraiser the next day, Flake's campaign told the paper.

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The Iowa senator is a consistent supporter of Trump, but also the most recent Republican to show support for Flake, who regularly criticizes Trump's views and has been personally attacked by the president.

Trump recently called Flake “weak on borders” and “weak on crimes.”

Flake's primary challenger Kelli Ward, a former state senator, is using Trump's criticism in campaign ads.

The senator has said he is not worried about the president's criticism, or his backing of Ward in the primary.