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.) said he is supporting Democrat J.D. Scholten in his bid to unseat three-term Rep. Steve King Steven (Steve) Arnold KingTrump, Biden deadlocked in Iowa: poll GOP leader: 'There is no place for QAnon in the Republican Party' Loomer win creates bigger problem for House GOP MORE (R-Iowa) over King's ties with white nationalist politicians and groups.

“We have a candidate on our side of the aisle who isn’t exactly making things easy for Republicans moving forward. It’s not the best face of the party,” Flake said on CNN’s “The Situation Room.”

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“Some of the statements he’s made over the years with regard to migrants coming across the southern border and more recent comments in this regard have just not been good for the country, certainly not good for the party,” he added, confirming he was talking about King.

The announcement comes as King faces intense scrutiny over his endorsement of a white nationalist candidate in Canada and comments that appeared to support the far-right Austria Freedom Party, which has historical ties to the Nazi party.

Rep. Steve Stivers Steven (Steve) Ernst StiversBusiness groups back pandemic insurance bill modeled on post-9/11 law National Retail Federation hosts virtual 'store tours' for lawmakers amid coronavirus Stronger patent rights would help promote US technological leadership MORE (R-Ohio), chairman of the National Republican Congressional Committee, blasted King’s comments and actions this week, tweeting, “Congressman Steve King’s recent comments, actions, and retweets are completely inappropriate. We must stand up against white supremacy and hate in all forms, and I strongly condemn this behavior.”

Congressman Steve King’s recent comments, actions, and retweets are completely inappropriate. We must stand up against white supremacy and hate in all forms, and I strongly condemn this behavior. — Steve Stivers (@RepSteveStivers) October 30, 2018

A number of companies, including tech giant Intel Corp. and dairy company Land O'Lakes, have announced in recent days that they will no longer contribute to King's campaign.

The controversy appears to be having an impact on King's once safe reelection campaign.

A poll released Tuesday showed King ahead of his Democratic opponent by just 1 point. The Cook Political Report also shifted the race from “Likely Republican” to “Lean Republican.” President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE won the district by 27 points in 2016.

Scholten also enjoyed a fundraising spike this week after anger with King boiled over.

Flake made headlines in December when he donated to the campaign of Democrat Doug Jones in his special election race against Republican Roy Moore Roy Stewart MooreVulnerable Senate Democrat urges unity: 'Not about what side of the aisle we're on' Sessions hits back at Trump days ahead of Alabama Senate runoff Judge allows Roy Moore lawsuit over Sacha Baron Cohen prank to proceed MORE in Alabama, saying, “A Roy Moore victory is no victory for the GOP and the nation.” Jones went on to win the election.

Moore was accused of sexual misconduct by several women who said they were in their teens at the time of the alleged incidents and he was in his 30s. Moore has denied the allegations.

Flake has also frequently criticized President Trump’s conduct.

“Some people ... expect me to become a liberal. I'm not, I'm a conservative,” Flake said on CNN. “People shouldn't expect me to vote in lockstep against the president simply out of spite.”