Possible GOP challenger says Trump doesn't deserve reelection, but would vote for him over Democrat

Former South Carolina Rep. Mark SanfordMarshall (Mark) Clement SanfordMark Sanford debates cardboard cutout of Trump to protest South Carolina canceling its GOP primary Joe Walsh: GOP is a 'cult' and Trump a 'would-be dictator' RNC spokeswoman on 2020 GOP primary cancellations: 'This is not abnormal' MORE (R), who is weighing a primary bid against President TrumpDonald John TrumpJimmy Carter: 'I hope there's an age limit' on presidency White House fires DHS general counsel: report Trump to cap California trip with visit to the border MORE, said on Sunday that he would vote for the president over a Democrat even though he said Trump doesn't deserve reelection.

NBC's Chuck ToddCharles (Chuck) David ToddBooker dismisses early surveys: 'If you're polling ahead right now, you should worry' O'Rourke's debate moment reignites gun debate on Sunday shows Liz Cheney says world is more stable, 'safer' under Trump MORE asked Sanford on "Meet the Press" if he believes Trump has earned reelection. 

"I would say no, because I would argue he's taking us in the wrong direction," Sanford replied. 

But, Sanford said he would still vote Trump over the Democratic nominee. 

"I am a core Republican," Sanford said. 

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"You just said you don't think he deserves reelection, but you're still going to be able to vote for him over Joe BidenJoe BidenJimmy Carter: 'I hope there's an age limit' on presidency 2020 candidates keep fitness on track while on the trail Mark Mellman: The most important moment in history? MORE?" Todd asked.

"Everything is relative in politics," Sanford said.

Sanford said the former vice president has embraced many of the progressive policies of his Democratic primary opponents, like Sen. Elizabeth WarrenElizabeth Ann WarrenKavanaugh impeachment push hits Capitol buzz saw Mark Mellman: The most important moment in history? Katie Pavlich: The Democrats' desperate do-overs MORE (D-Mass.)

"I'm not seeing a great differentiation there, but I may be missing it." 

Sanford made a similar argument in saying he would not consider running as an independent, even though he added that he understands the difficulty in challenging a sitting president in a primary. 

"A lot of people said, 'If you're going to run, run as an independent.' I said no. I'm a Republican. The Republican Party has a lineage of historically doing some great things, but it's gone off the tracks as of late," Sanford said. 

He also admitted he is likely not the strongest candidate to mount a challenge against Trump, saying "I'm sure there are a bunch" of better options. 

Sanford lost a Republican gubernatorial primary, largely due to criticism from Trump. 

But if he chooses to run, it is not a "vanity project," he said.

"The idea of going out and possibly being a human piñata is hardly a vanity project," Sanford said. 

"What does success look like for you?" Todd asked.

"You can compete for ideas, if we began a national conversation on where are we going.. where are we going with the Republican Party in terms of what comes next," Sanford responded.