Donald Trump mocked Democratic rival Hillary Clinton for saying that she had "short-circuited" when discussing her email controversy.
The Republican presidential candidate told a rally in New Hampshire that Mrs Clinton's "got problems" and Americans "don't want someone who's going to short-circuit".
Mr Trump also said that Islamic State militants are “salivating” at the prospect of Mrs Clinton’s election.
Anybody whose mind "SHORT CIRCUITS" is not fit to be our president! Look up the word "BRAINWASHED."
— Donald J. Trump (@realDonaldTrump) August 6, 2016
The billionaire businessman was speaking in a hot gymnasium in Windham, New Hampshire, the state that gave him his first primary victory.
Mrs Clinton this week suggested that she "may have short-circuited" when she incorrectly claimed that FBI director James Comey said her answers to the bureau about her use of a private email server were "truthful".
Mr Trump tweeted earlier: “Anybody whose mind ‘SHORT CIRCUITS’ is not fit to be our president!”
Trump’s victory in the February 10th Republican primary in New Hampshire put him in position to win the party’s nomination, but he trails Clinton in the state by 15 points in the latest WBUR/MassINC poll, 47 per cent to 32 per cent.
Trump came to New Hampshire after a troubled week in which he tangled with fellow Republican leaders and sparred verbally with the parents of a Muslim soldier who died fighting for the United States in Iraq in 2004.
Clinton, getting a lift from the Democratic National Convention, took advantage of Trump’s stumbles to surge into the lead in national polls and in many battleground states.
Now Trump has begun heeding the advice of Republican officials who say he needs to take the fight to Clinton to give the party a chance to win the White House on November 8th.
Trump sought to turn the tables on Clinton, who has consistently accused the New York developer of being temperamentally unfit to be president.
“She is a totally unhinged person,” Trump said.
Agencies