U.S. President Joe Biden has said part of his motivation to run for a second term next year is to prevent Donald Trump from returning.

This was reported by the BBC.

"We can't let him win," Biden told reporters.

On Fox News, Trump did not rule out abuse of power if he returned to the White House. The Republican also said that he considers Biden too old for such a political revenge.

None of the candidates is yet an official nominee from their party. Trump is the leader of the Republican race, even though four criminal cases have been filed against him. Biden, as the incumbent president, is the likely candidate of the Democratic Party.

Current opinion polls point to a hypothetically intense fight between the two as the White House campaign unfolds in 2024.

Speaking off-camera at a campaign fundraising event near Boston, Biden said, "If Trump hadn't run, I'm not sure I would have run.

Trump reacts to Biden saying "If Trump wasn’t running, I’m not sure I’d be running" pic.twitter.com/ztiiLrQRtP

— The Post Millennial (@TPostMillennial) December 6, 2023

These words of the president were regarded as the first time that he linked his aspirations for a second term directly to opposing Trump's attempt to return to office.

Later on Tuesday, December 5, Trump appeared on the Fox News television program in Davenport, Iowa. Host Sean Hannity asked, "Are you promising America today that you will never abuse your power to take revenge on anyone?"

"Except for the first day," Trump replied. "I want to close the border and I want to drill, drill, drill."

Earlier in the interview, Hannity asked the former president if he was planning "in some way", if re-elected president, to abuse his power, to break the law in order to use the government to persecute people.

"You mean what they're using right now?" replied Trump. He also said he didn't think Biden would "physically endure" the upcoming grueling campaign.

Hannity: "Do you think he (Biden) will be their candidate?"

Trump: "I personally don't think he makes it. He's in bad shape physically. And mentally he's equally as bad and maybe worse. He's got vicious people surrounding him. Young, vicious. They're communists." pic.twitter.com/5Rj6xu0hKo

— TheBlaze (@theblaze) December 6, 2023

His rival's mental state, he said, is "perhaps as bad or even worse" than his physical condition.

Earlier, President of Ukraine Volodymyr Zelensky commented on Trump's possible victory in the US presidential election.