Former President George W. Bush will help raise funds for Rep. Liz Cheney (R-Wyo.) next month as the Wyoming congresswoman faces a primary challenge from former President Donald Trump–backed Harriet Hageman.

A tweet from Politico reporter Olivia Beavers on Wednesday, Sept. 22, showed that the fundraising event would be held on Oct. 18 in Dallas, Texas, with Bush appearing as a special guest.

Other guests include former Bush advisors Karl Rove and Karen Hughes, former Bush White House counsel Harriet Miers, and former Texas senator and U.S. ambassador to NATO Kay Bailey Hutchison.

Bush spokesman Freddy Ford told CNBC that the former president “is impressed by Liz Cheney’s strength and vision, and he’s proud to support her.”

“This one shouldn’t come as any surprise,” Ford added, saying Bush “has historically helped a few key candidates and friends each cycle.”

However, Bush has largely stayed mum on electoral politics since he left office in 2009 with overwhelmingly negative approval ratings.

The fundraiser comes as Cheney, whose father Dick Cheney served as vice president under Bush, is in the race for Wyoming’s single U.S. House district and facing the challenger Hageman, a former Republican National Committee member who got Trump’s endorsement.

Cheney is also under pressure after being stripped of her role as the No. 3 House Republican after she voted to impeach Trump in the House, but the former president was acquitted in the Senate.

The fundraising event, Bush is expected to once again clash with Trump.

According to Forbes, the two ex-presidents clashed several times this year—Trump snubbed the Bush family in July by endorsing incumbent Texas Attorney General Ken Paxton over challenger George P. Bush, the former president’s nephew.

More recently, Bush caught Trump’s ire during a 9/11 event by saying domestic and foreign extremists are “children of the same foul spirit”—widely seen as a reference to the Capitol riot—with Trump blasting Bush’s “failed and uninspiring presidency.”

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