Donald Trump's mental state has been called into question, even by some of his supporters, with several calls being made for him to undergo a psychiatric examination. This followed a calamitous week for the Republican Party nominee for the US presidency.Trump's devastating wounds were mostly self-inflicted and arose from a series of bewildering gaffes, petty feuds and xenophobic comments that left even supporters questioning his state of mind and wondering if it were too late to replace him.Democrat rival for the White House Hillary Clinton had widened her lead over Trump to eight points - 50% to 42% among registered voters - by yesterday, according to a Washington Post-ABC News poll.Joe Scarborough, a former Republican congressman turned political talk-show host, said he had received numerous calls asking about Trump's mental health.Scarborough, formerly a friend of Trump, said: "It was all everybody was talking about. Everybody was saying: 'What's happening to him? What is wrong with him'?"Karen Bass, a Democrat congresswoman, launched an online petition calling for Trump to undergo a mental health evaluation, suggesting he might have "narcissistic personality disorder".Trump's bad week began when he picked a fight with the parents of Captain Humayun Khan, a Muslim US soldier killed in Iraq in 2004 by a suicide bomber. Khan's father had spoken at the Democratic convention in July, lambasting Trump for his proposal to ban Muslims.In response, Trump implied that Khan's wife, Ghazala, had not been allowed to speak publicly because of the couple's Muslim faith.Perhaps even more damaging was Trump's refusal for several days last week to endorse Paul Ryan, the most senior Republican official, who is seeking re-election to Congress. But his running mate, Mike Pence, enthusiastically endorsed Ryan.Trump then made gaffes that included not knowing Russia had taken the Crimean Peninsula two years ago. And it was alleged that he had asked three times at a foreign policy briefing why he could not use nuclear weapons as president. ..