US President, Joe Biden has blamed his poor debate performance on jet lag, saying he “wasn’t very smart” for “travelling around the world a couple of times” before the debate.
“I didn’t listen to my staff… and then I nearly fell asleep on stage,” he said.
Biden, 81, last returned from travel on 15 June, nearly two weeks ahead of the 27 June debate.
The president’s remarks come amid intra-party panic ahead of November’s election over his mental fitness, and after a congressman from Texas became the first sitting Democratic lawmaker to call for him to step aside following the debate.
Biden appeared to struggle through some responses during a debate with former President Donald Trump last Thursday.
“It’s not an excuse but an explanation,” he said at a private fundraiser in Virginia on Tuesday evening, referring to his travel.
He also apologised for his performance and said it was “critical” that he win re-election.
Biden made two separate trips to Europe within two weeks last month.
On 15 June, he appeared at a fundraiser alongside former President Barack Obama after an overnight trip from Italy. He returned to Washington DC the following day.
White House officials have previously said he was battling a cold on the day of the debate.
The president did not mention any illness in his remarks on Tuesday. A spokeswoman for the White House said earlier in the day that he was not taking any cold medication during the debate.
Biden is currently the Democratic Party’s presumptive nominee for the White House and has vowed to stay in the race despite the debate performance.
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