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 SanfordMarshall (Mark) Clement SanfordGOP presidential challengers condemn decision to host G-7 at Trump resort One person shows up to Trump challenger Mark Sanford's formal 2020 campaign kickoff George Conway donates to Trump challenger Joe Walsh MORE, a Republican challenging President TrumpDonald John TrumpFlorida GOP lawmaker says he's 'thinking' about impeachment Democrats introduce 'THUG Act' to block funding for G-7 at Trump resort Kurdish group PKK pens open letter rebuking Trump's comparison to ISIS 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 TapperBiden praises Buttigieg for criticizing GOP attacks: 'That's a good man' White House officials stand by Syria withdrawal, sanctions delay amid bipartisan pushback Kasich to Congress: 'Look in the mirror at how you want to be remembered' MORE asked Sanford on CNN's "State of the Union" if he would vote for Trump over Vice President Joe BidenJoe BidenTrump knocks Romney as 'Democrat secret asset' in new video Giuliani asked State Dept. to grant visa for ex-Ukraine official at center of Biden allegations: report Perry won't comply with subpoena in impeachment inquiry 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 WalshGOP presidential challengers condemn decision to host G-7 at Trump resort One person shows up to Trump challenger Mark Sanford's formal 2020 campaign kickoff George Conway accuses Trump of being a 'sociopath' 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.