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Donald Trump's critics have long claimed he doesn't know what he's doing.

Now, thanks to the President, they've been given some new ammunition.

The Republican just tweeted about his arrival at the G7 summit in Sicily... a full day after he left.

The hastily-deleted missive said: “Just arrived in Italy after having a very successful Nato meeting in Brussels.

“Told other nations they must pay more, not fair to US."

It was posted at 12.57pm on Sunday British time, around 11 hours after the President stepped back into the White House after returning from Italy.

He later replaced the tweet with the words: "Just returned from Europe. Trip was a great success for America. Hard work but big results!"

The gaffe was made all the more impressive by the fact the President's Twitter cover photo is of the G7 summit he's returned from.

President Trump could be forgiven for being jetlagged.

His tour lasted more than a week and took in Saudi Arabia, Israel and a summit with the Pope in Vatican City.

But it was when he met world leaders at Nato and the G7 summits that things got chaotic.

He barged one world leader out of the way for a photo shoot, grappled with the French President, and then publicly attacked his NATO allies for not spending enough on defence.

He was also confronted by Britain's Theresa May over a string of damaging leaks of information about the Manchester terror attack to US media.

(Image: Reuters) (Image: Getty)

The mayhem continued in Sicily as he insulted Angela Merkel over her trade policies.

The US President told fellow G7 leaders that “the Germans are bad, very bad" in comments leaked to the German press.

As the Germans erupted in anger Trump's economic adviser Gary Cohn was forced to clarify his comments.

“(Trump) said 'I don't have a problem with Germany, I have a problem with German trade',” Mr Cohn insisted.