President Trump's tweets attacking 'Morning Joe' presenters have been widely criticised in the US
A pair of TV hosts have questioned Donald Trump's mental state after the US President targeted them on Twitter.
Mika Brzezinski and Joe Scarborough hit back after becoming the latest victims of Mr Trump's frequent social media attacks.
The President called Brzezinski "crazy" and labelled Scarborough a "psycho" after apparently being angered by the duo's Morning Joe programme on MSNBC.
The presenters, who are engaged to be married, delayed a planned holiday to respond to Mr Trump's outburst.
In a joint piece for the Washington Post, they raised concerns about the President's "unmoored behaviour", writing: "America's leaders and allies are asking themselves yet again whether this man is fit to be president.
"We have our doubts, but we are both certain that the man is not mentally equipped to continue watching our show, Morning Joe."
They added Mr Trump's "unhealthy obsession" with their programme "does not serve the best interests of either his mental state or the country he runs".
In his tweets, the President had claimed Brzezinski was "bleeding badly from a face-lift" when he met the pair at his Mar-a-Lago resort in Florida around New Year's Eve.
In their article, Brzezinski and Scarborough, a former Republican congressman, expressed their concern about Mr Trump's "unrelenting assault on women", following his previous clashes with a female journalist and a former Miss Universe, as well as his boast about groping women.
They denied Brzezinski had ever had a face-lift but said she "did have a little skin under her chin tweaked".
On their Morning Joe show on Friday, the couple described how they believed Mr Trump had been angered after they mocked the President over reports Time magazine asked him to remove fake covers bearing his image from his golf clubs.
Brzezinski said Mr Trump appears to have a "fragile, impetuous, child-like ego…. especially with women", adding: "It is unbelievably alarming that this President is so easily played. He's so easily played by a cable news host.
"Now what is this saying to our allies? What is this saying to our enemies that our President is so easily played?"
The duo's row with the President escalated further on Friday when Mr Trump denied their claim that senior White House staff warned them earlier this year the National Enquirer tabloid was planning a negative story about them.
The story would have been cancelled if they called the President and "begged", the pair said they were told.
Mr Trump tweeted on Friday:
Watched low rated @Morning_Joe for first time in long time. FAKE NEWS. He called me to stop a National Enquirer article. I said no! Bad show— Donald J. Trump (@realDonaldTrump) June 30, 2017
The National Enquirer has been one of Mr Trump's strongest supporters, with the President previously reported to have a close relationship with the chief executive of the tabloid's parent company.
Mr Trump's attack on the presenters has been widely condemned, including by his fellow Republicans.
But White House spokeswoman Sarah Huckabee Sanders claimed the President was "pushing back against people who have attacked him day after day after day".
She said: "The American people elected a fighter; they didn't elect somebody to sit back and do nothing."