Sanford: 'I don't know' if I would vote for Trump in 2020

Sanford: 'I don't know' if I would vote for Trump in 2020
© Greg Nash

Former South Carolina Rep. Mark SanfordMark SanfordBritain checking gun license applicants' social media, medical records Mark Sanford calls Graham 'a canary in the coalmine' on GOP's relationship with Trump Top cyber Pentagon official overseeing defense contractor project placed on leave MORE, a Republican challenging President TrumpDonald TrumpFormer New York Assembly Speaker Sheldon Silver dead at 77 Biden, Democrats losing ground with independent and suburban voters: poll Bipartisan Senate group discusses changes to election law MORE in a longshot primary campaign, said on Sunday that he isn't sure if he would still consider voting for Trump in 2020, despite allegations that the president solicited foreign interference to benefit him politically. 

Host Jake TapperJacob (Jake) Paul TapperMcCaul says US withdrawal from Afghanistan has emboldened Russia on Ukraine Sunday shows - Voting rights legislation dominates Texas Republican: FBI probe into synagogue hostage taker spreads to London, Tel Aviv MORE asked Sanford on CNN's "State of the Union" if he would vote for Trump over Vice President Joe BidenJoe BidenFox News reporter says Biden called him after 'son of a b----' remark Peloton responds after another TV character has a heart attack on one of its bikes Defense & National Security — Pentagon puts 8,500 troops on high alert MORE if they end up being the candidates in 2020. 

"I don’t know," Sanford responded. "What I've said is I'm an issue guy." 

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Sanford said he's going to base his decision on "who is going to be closest to me" with a focus on debt and spending. 

Former Illinois Rep. Joe WalshJoe WalshThe Memo: Never Trumpers sink into gloom as Gonzalez bows out The Memo: 'Hillbilly Elegy' author binds himself to Trump after past criticism Joe Walsh says radio show canceled due to Trump criticism MORE, a fellow 2020 GOP challenger, said there is "no way in hell" he would vote for Trump.

"I'm running against President Trump because he's unfit," Walsh said. 

"The debate is about Trump, period," he added. 

The Republicans were also split on where they stand on impeachment, with Walsh saying the president deserves to be impeached based on his public actions alone and Sanford saying Congress needs to follow a formal investigation process. 

Trump is facing an impeachment inquiry after a whistleblower came forward with allegations that Trump asked Ukraine to investigate Biden and his son. 

A partial memo of a call between Trump and Ukrainian President Volodymyr Zelensky shows Trump asking the foreign leader to investigate the Bidens. 

Trump publicly called on China and Ukraine to investigate the Bidens when speaking to reporters last week.