Hours after Clinton, 68, deplored the "tone and inflammatory" rhetoric of her GOP rival's campaign, Trump, 69, on Twitter described her policies as the Secretary of State as stupid, which he claimed resulted in death and destruction.

"Hillary said 'I really deplore the tone and inflammatory rhetoric of his campaign.' I deplore the death and destruction she caused - stupidity," Trump said on Twitter last night.

A CNN/ORC poll released yesterday said Clinton, former Secretary of State, had a narrow edge over Trump - 49 per cent to 47 percent - in a hypothetical general election matchup.

A day earlier, Clinton in an interview to Des Moines Register deplored the tone of Trump's campaign.

It all started over the weekend, Clinton, during the Democratic Party's presidential debate, alleged that videos of Trump's anti-Muslim rhetoric was becoming a recruitment tool for militant groups.

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