'I don't trust him': Senior Republicans voice fears over Donald Trump winning candidacy

Senior members of the US Republican party have begun rallying against leading presidential candidate Donald Trump, after his sweeping victory on Super Tuesday.

The billionaire businessman won seven of the 11 states up for grabs on the day - the single biggest day of voting during the campaign.

His controversial comments on Muslims, Mexicans and women have earned him widespread criticism, but do not appear to have dimmed his prospects at the ballot box.

He has currently secured 46 per cent of the number of delegates awarded so far - to secure his position, he will need to increase his share to 52 per cent in the remaining states.

Since the results were announced, more than 50 Republican foreign policy veterans signed a letter vowing to oppose Trump and rejecting his proposals

Among those to sign the letter is Max Boot, the former foreign policy adviser to Mitt Romney's 2012 campaign.

"I would sooner work for [North Korean dictator] Kim Jong Un than for Donald Trump," he said.

"I think Donald Trump is objectively more dangerous than Kim Jong Un and not as stable."

A number of other senior US politicians have also spoken out against Trump's campaign, including Lindsey Graham.

The South Carolina senator has been vocal in saying he does not believe Trump can beat the Democratic frontrunner Hillary Clinton in a head-to-head race for the presidency.

He said he would rather support Texas senator Ted Cruz as the next best candidate.