Washington (CNN) Maryland's Republican governor, who's viewed as a potential primary challenger to President Donald Trump in 2020, said the President's poll numbers show he's "pretty weak in the general election."

Maryland Gov. Larry Hogan made the comments to CBS News in an interview set to air Wednesday morning as the moderate Republican continues to mull a possible primary challenge to Trump.

"The issue I'm concerned about is he has a very low re-elect number, I think in the 30s, high 30s, low 40s," Hogan said in the interview. "So the chance of him losing a general election are pretty good. I'm not saying he couldn't win, but he's pretty weak in the general election."

According to Gallup's most recent poll, Trump's overall favorability is at 44% . But a CNN poll from last month showed that the President maintains strong support within the party, with 81% of Republicans approving of Trump's performance as President.

Hogan added that Trump's unpopularity could jeopardize the entire Republican fold, especially if the President faces a "very far-left" opponent.

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