Donald Trump stepped up his attacks on Hillary Clinton by accusing her of 'Third World' corruption after revelations about donor access to the Democratic candidate.

The Republican nominee called the revelations about Clinton and her family's charitable foundation a 'disgrace' and a 'threat to the foundation of democracy' at a rally in Austin, Texas.

A report revealed that more than half the people outside government who met Clinton while she was Secretary of State donated money to the Clinton Foundation.

Donald Trump stepped up his attacks on Hillary Clinton by accusing her of 'Third World' corruption after revelations about donor access to the Democratic candidate

'It is a total embarrassment if our secretary of state can be bought or bribed or sold,' Trump said.

'It's a disgrace, this is a threat to the foundation of democracy. This is what happens in Third World countries.'

The Associated Press reported that at least 85 of 154 people from private interests who met or had telephone conversations scheduled with Clinton while she led the State Department donated to her family charity or pledged commitments to its international programs.

Those 85 donors contributed a combined $156million, the AP said.

The Republican nominee called the revelations about Clinton and her family's charitable foundation a 'disgrace' and a 'threat to the foundation of democracy' at a rally in Austin, Texas

'It is a total embarrassment if our secretary of state can be bought or bribed or sold,' Trump said

The report said the meetings between Clinton and donors did not appear to violate legal agreements she and her husband, former president Bill Clinton, signed before she joined the State Department.

'But the frequency of the overlaps shows the intermingling of access and donations, and fuels perceptions that giving the foundation money was a price of admission for face time with Clinton,' the AP reported.

Trump said last night: 'Hillary Clinton is totally unfit to hold public office. It is impossible to figure out where the Clinton Foundation ends and the State Department begins.

'It is now abundantly clear that the Clintons set up a business to profit from public office, they sold access.

'This is corruption and this is why I have called for a special prosecutor to look into this mess.'

A report revealed that more than half the people outside government who met Clinton while she was secretary of state donated money to the Clinton Foundation

Republican vice presidential nominee Mike Pence has also called for the foundation to be 'immediately shut down'

Clinton Foundation President Donna Shalala has said the non-profit group is working to 'spin off' or 'find partners' for many of its programs, including all international activities and programs funded by foreign or corporate donors, according to NPR.

The Foundation also announced that Bill Clinton would step down from the group's board if Hillary were to be elected president.

In 2014, the Clinton Foundation reported $439million in assets and $338million in revenue.

Republican vice presidential nominee Mike Pence has also called for the foundation to be 'immediately shut down'.

With 75 days to go until the November 8 election Trump remains more than five per cent down on Clinton in an aggregate of national polling.