While former President Donald Trump announced a week after the midterms that he will run, many voters are waiting to hear if President Joe Biden will announce a reelection bid, which could lead to a rematch, both battling for a second term.

Biden has said he plans to announce whether he will run by early 2023, and he’s keeping voters on their toes by briefly dismissing a voter’s request that he run again during the White House Tribal Nations Summit on Wednesday.

At the end of the president’s remarks, which included discussion on important issues facing Tribal communities and was hosted at the Department of the Interior, a crowd member began to chant “Four more years!”

“I don’t know about that,” Biden said while waving a hand. “Thanks.”

The exchange was tweeted by The Recount and has been viewed more than 3,500 times.

At 80, Biden is the oldest president in U.S. history. If he were to win a reelection bid, by the end of his second term, Biden would be 86. Constituents have long voiced concern about Biden’s age, especially if he were to run for a second term. Critics of the 46th president, including Trump, who is 76, have asked Biden to take a cognitive test to prove he is still capable of serving.

A New York Times article published shortly before Biden’s 80th birthday this month said the downside of an aging president is that the risk of age-related disease and death rises, but many geriatric experts said elderly people maintain their cognitive abilities by remaining active.

The article also mentioned a White House medical report released by Biden’s personal physician, Dr. Kevin O’Connor. According to the article, the president is prescribed medication to manage cholesterol and atrial fibrillation. Biden also has experienced increased throat clearing, possibly due to acid reflux, and stiffness while he walks.

Last year, Newsweek reported on a Fox News poll that showed more than half of the survey’s participants thought Biden’s age was “interfering with his ability to serve effectively as president.”

Biden previously said he hopes to discuss a possible second term with his wife, Jill, before making an announcement early next year.