Author Douglas Murray has raised concern about US President Joe Biden after he struggled to get through his NATO summit speech.

The US President started strong during the NATO summit with some words on Ukraine but started stumbling throughout the speech.

“You can’t really pretend that this is a man at the height of his powers or even with any real powers – it’s very sad,” Mr Murray told Sky News host Danica De Giorgio.

“The people who support the Democrats in America or would like to vote against Trump should just reflect on what their instinct is - when they see something like that, do they think this guy has got another four years in him.

“Or do they think, as many of us do, this is cruel of Jill Biden and Hunter Biden and the rest of the family not to be saying to him ‘step down now Joe, allow a new generation to come in, leave with some dignity, protect your legacy and past the baton on’ - it’s cruel that they’re not saying that.

“Feels like a late empire problem, and I hope it’s not.”