Joe Biden appeared to stumble through a key speech about the Middle East conflict in the latest in a series of gaffes.
The 81-year-old President was giving an update to the conflict in the Middle East at the White House.
However, he appeared to stumble through his speech, including briefly forgetting the name of Hamas.
It comes as there have been concerns over the President's age from both the left and right wing.
Joe Biden was providing an update on the conflict in the Middle East
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The US President said: "There is some movement...and I don't wanna...I don't wanna.
"[After a pause] Choose my words...there's some movement.
"There's been a response...from the uh...there's been a response from the opposition.
"But - yes I'm sorry - from Hamas but it seems to be a little over the top. We're not sure where it is...there's continuing negotiation right now."
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It is the latest in a series of gaffes by the President
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Leader of Reform UK Richard Tice said: "This is sad to see, but President Biden is visibly & clearly no longer fit to be leader of the free world."
Left wing commentator Owen Jones added: "Come on. This man cannot stand against Donald Trump in an election."
Martin Daubney said: "For the sake of global security, Joe Biden needs to be retired from public office. Enough is enough. He can no longer be trusted to run a bath - let alone the free world."
Sky News US Correspondent Mark Stone said: "This, from President Biden, tells us something about how the negotiations between Israel & Hamas are going.
"It also, frankly, shows why so many in America and beyond are concerned about the age of the American president who is insisting on running again."
Former President Trump at a campaign rally in Las Vegas
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Biden easily won Nevada's Democratic presidential primary after dominating his party's first nominating contest in South Carolina on Saturday.
With more than 70 per cent of votes counted, Biden had 90 percent support. As the incumbent president faces little opposition within his own party to running for re-election in a likely general election rematch with Trump in November.
Meanwhile, Trump, who has had his fare share of similar gaffes, is set to secure all of Nevada’s delegates in a separate caucus vote on Thursday, as he moves closer to clinching the nomination after back-to-back wins in Iowa and New Hampshire.
The former President did not compete in Tuesday's primary, which carried no weight in the Republican presidential nominating contest. His closest opponent Nikki Haley is not on the ballot in Thursday's caucus.