Clinton in eye of Trump storm

Donald Trump stepped up his attacks on Hillary Clinton Tuesday as her campaign battled to silence suggestions that donors to her family's charity paid for access when she was America's top diplomat.

The Democratic nominee, looking to make history as America's first female commander-in-chief, is polling well ahead of her Republican rival but has hit choppy waters this week as the Trump campaign has fought to rebound from a series of damaging self-inflicted wounds.

"Hillary Clinton is totally unfit to hold public office," Trump told a rally in Austin, Texas interrupted several times by protesters.

"It is impossible to figure out where the Clinton Foundation ends and the State Department begins," he added.

Hours earlier, the Associated Press reported that more than half the people outside government who met Clinton while she was secretary of state donated money to the Clinton Foundation.

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

"This is corruption and this is why I have called for a special prosecutor to look into this mess," he said.

The Trump campaign demanded an independent probe after conservative group Judicial Watch, which has targeted Clinton for years, released nearly 15,000 emails sent from her private server.

Among the emails are some purporting to show that donors to the Foundation lobbied one of her top aides, Huma Abedin, for access to Clinton.

Clinton campaign spokesman dismissed the AP analysis as based on "utterly flawed data" that "cherry-picked" from her schedule.

The charity has raised some $2 billion since it was founded in 2001 after Bill Clinton stepped down as president and disburses funds domestically and overseas, handing out some $218 million in 2014.

Bill Clinton announced this week that if his wife is elected, the foundation will accept only US contributions, that he will step down from the board and will no longer raise funds for the charity.

With Clinton now leading 47 percent to Trump's 41.5 percent, according to an average of national polls from Real Clear Politics, it is unclear to what extent the new reports can damage her standing.