David Axelrod, a prominent Democratic political strategist and former White House official, said on Sunday that President Joe Biden needed to think carefully about whether he should continue to seek reelection.

“Only @JoeBiden can make this decision,” Axelrod wrote on X, formerly known as Twitter. “If he continues to run, he will be the nominee of the Democratic Party. What he needs to decide is whether that is wise; whether it’s in HIS best interest or the country’s?”

Axelrod — who is best known as the driving force behind former President Barack Obama’s 2008 and 2012 runs for president and served as a senior adviser in his administration — was responding to new polling from The New York Times and Siena that showed Biden struggling in key battleground states against former President Donald Trump. Axelrod posited those numbers as a reality check.

“It’s very late to change horses,” Axelrod wrote, “a lot will happen in the next year that no one can predict & Biden’s team says his resolve to run is firm.”

“He’s defied CW before,” Axelrod continued, most likely referring to the conventional wisdom — “but this will send tremors of doubt thru the party — not ‘bed-wetting’ but legitimate concern.”