Joe Walsh urges Republicans to 'say publicly what you think privately' about Trump

Former Rep. Joe WalshJoe Walsh2020 Presidential Candidates Trump campaign takes steps to ensure critics are not represented at 2020 convention Sunday shows - Second whistleblower grabs spotlight MORE (R-Ill.), the one-term congressman and radio host who has launched a primary challenge to President TrumpDonald John TrumpWHCA calls on Trump to denounce video depicting him shooting media outlets Video of fake Trump shooting members of media shown at his Miami resort: report Trump hits Fox News's Chris Wallace over Ukraine coverage MORE, urged Republicans to express publicly what they say in private about Trump. 

"I've been in conservative talk radio for the last five years, and the people I talk to generally privately tell me 'I can't stand him, but Joe, the Democrats are socialists' or 'I can't stand him Joe, but I like my tax cuts,'" Walsh said in a CNN interview on Monday. 

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"The bet I'm making with this campaign and our slogan is be brave, which is come on out. Say publicly what you believe privately," he added.

Walsh also said he believes he can defeat Trump. 

"I'm doing this to win," he said."Who in their right mind ... would take this on ... if they didn't think they could win?"

Polling has consistently shown strong Republican support for the president. 

Walsh announced Sunday that he was running against Trump as a Republican. He is the second person to challenge Trump in the primaries: former Massachusetts Gov. Bill WeldWilliam (Bill) WeldTrump campaign takes steps to ensure critics are not represented at 2020 convention Ex-GOP lawmaker sues South Carolina Republican Party for canceling 2020 primary Juan Williams: Trump's grip on GOP Senate may come loose MORE (R) joined the race earlier this year.