President Joe Biden has revealed that he is running for re-election in 2024 because he wants to stop former President Donald Trump from winning the White House again.

Presidents Trump and Biden are their parties’ frontrunners for the 2024 presidentiaL nominee. Both men are expected to go head to head in 2024, in what will be a rematch of the 2020 presidential election. However, Joe Biden’s age has become a major source of concern for many, including members of his own party.

Biden, while speaking at a Tuesday donor event in Boston, Massachusetts, said he would not be seeking re-election if Trump was not running.

“If Trump wasn’t running, I’m not sure I’d be running. But we cannot let him win,” Biden said.

Biden’s remark signifies a major shift from his previous position in April when he claimed that he would run in 2024 regardless of whether Trump runs. Joe Biden, in a joint press conference with President Yoon Suk Yeol of the Republic of Korea, told reporters that he was running for re-election to finish the job he started.

“Yeah, I think I still would be running if he wasn’t. I — I do know him well. He’s not hard to know, as you know,” Biden said. “You know him well, too. And the question is whether or not — look, there’s just — there’s more to finish the job. We have an opportunity to put ourselves in a position where we are economically and politically secure for a long time.”

Trump has, however, expressed doubt that he will be facing off with Biden in 2024. The former president, in a town hall meeting, said Biden’s physical and mental shape will prevent him from running.

“I personally don’t think he makes it,” Trump said. Okay, I haven’t said that, I’m saving it for this big town hall. I personally don’t think so. I think he’s in bad shape physically. Remember when he said I’d like to take him behind the barn? If he took me behind the barn and I went like this [blows air ], I believe he would fall over. I believe he would fall over. I watched him at the beach. He wasn’t able to lift a beach chair which was meant for children. Mentally, I would say he’s possibly equally as bad and maybe worse. ”