George Conway George Thomas ConwayGeorge and Kellyanne Conway honor Ginsburg Lincoln Project releases new ad blasting Trump as 'a horrible role model' George Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' MORE donated $5,600 to former Rep. Joe Walsh Joe WalshSunday shows preview: Protests continue over shooting of Blake; coronavirus legislation talks remain at impasse Republicans officially renominate Trump for president Tucker Carlson responds to guest correcting pronunciation of Kamala Harris's name: 'So what?' MORE’s (R-Ill.) primary challenge to President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE, according to Federal Election Commission filings.

Conway, who is married to White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE but is an outspoken critic of Trump, made the donation to Walsh’s long-shot campaign on Aug. 30, five days after the formal campaign launch, according to the filing. Walsh raised about $129,000 between August and September.

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Conway’s two $2,800 donations are the biggest total single-donor contribution to Walsh’s campaign thus far, although records indicate two cases in Illinois where a married couple each donated $2,800.

Walsh said in September that Conway is informally advising his presidential campaign, in an interview with CNN’s Fredricka Whitfield.

“I am honored to have his advice. I speak with him often. He's a wonderful adviser," Walsh said of Conway. "As far as any formal role with our campaign, I would only be so lucky as to have somebody like George Conway involved."

Conway has also recently expressed his support for impeaching Trump, joining 15 other attorneys on an open letter calling for an “expeditious impeachment investigation" into Trump’s attempts to persuade Ukrainian officials to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE’s son Hunter Biden.

Walsh is one of three Republican primary challengers to Trump, along with former Massachusetts Gov. Bill Weld William (Bill) WeldRalph Gants, chief justice of Massachusetts supreme court, dies at 65 The Hill's Campaign Report: Biden visits Kenosha | Trump's double-voting suggestion draws fire | Facebook clamps down on election ads Biden picks up endorsements from nearly 100 Republicans MORE and former Rep. Mark Sanford Mark SanfordOn The Money: Business world braces for blue sweep | Federal Reserve chief to outline plans for inflation, economy | Meadows 'not optimistic' about stalemate on coronavirus deal Trump critic Sanford forms anti-debt advocacy group Republicans officially renominate Trump for president MORE (S.C.).