US Republican presidential candidate Donald Trump speaks at the American Legion Convention September 1, 2016 in Cincinnati, Ohio. (AFP photo)

Donald Trump has called American journalist Mika Brzezinski “crazy and very dumb” after she suggested the Republican presidential nominee might not be mentally fit to serve as the US president.
Brzezinski said on Monday on  her television show that “it's time to hear from somebody in the mental health community, to look at this person who has been on television for months and give us a sense of what we have going on here.”
“Let’s stop pretending we’re dealing with someone who we can completely understand,” she said.
Brzezinski said that she and Joe Scarborough, the co-host of the “Morning Joe” program on MSNBC, have been asked hundreds of times about Trump’s mental health by people. 
On Friday, Trump wrote on Twitter that he had heard that Brzezinski “had a mental breakdown while talking about me" on air.
“Joe [Scarborough] a mess!” he added.
Scarborough has also repeatedly mocked Trump by describing him as "Amnesty Don” when it was reported that he would be softening his hard-line stance on immigration.
But Trump has particularly targeted Brzezinski, tweeting last week that she was "a neurotic and not very bright mess!"
Brzezinski is the daughter of American foreign policy scholar Zbigniew Brzezinski, the national security adviser to former US President Jimmy Carter.

On Sunday, Trump called on his Democratic rival, Hillary Clinton, to release "detailed medical records,” adding he would have "no problem" issuing his own medical report.
But his only public medical record -- a letter written by his physician that was released in December -- has recently been under scrutiny.
The New York billionaire’s doctor, Harold Bornstein, wrote in December that Trump’s medical examination "showed only positive results."
"If elected, Mr. Trump, I can state unequivocally, will be the healthiest individual ever elected to the presidency," Bornstein wrote in the letter dated December 4.
Doesn’t a positive result mean a negative outcome in medical examinations? Trump’s opponents have asked.