Donadl Trump is taking far-right hate groups mainstream: Hillary Clinton

Hillary Clinton will paint her White House rival Donald Trump as the candidate of the far right today, claiming "a radical fringe" has taken over the Republican Party.

After releasing a hard-hitting ad that tethered Trump to the Ku Klux Klan, Clinton will use a speech in Reno, Nevada to argue he has brought racism to the political mainstream.

"From the start, Donald Trump has built his campaign on prejudice and paranoia," Clinton will say, according to excerpts released by her campaign.

"He's taking hate groups mainstream and helping a radical fringe take over one of America's two major political parties."

As Trump strives to temper his hardline anti-immigrant message in a bid to halt collapsing poll numbers, Clinton's campaign has been at pains to remind voters of the New York tycoon's more controversial views.

Trump has in the past described Mexicans as rapists and drug dealers, and vowed to round up illegal immigrants and build a wall on the southern border — for which he would make Mexico pay.

In New Hampshire, Trump trashed Clinton's claims about him and his supporters.

"She paints decent Americans as racists," he said to angry jeers.

Clinton has accused "decent Americans who support this campaign, your campaign, of being racists, which we are not" he said to angry jeers from the crowd.

"It's a tired, disgusting argument."

Trump also accused Clinton of being behind a "vast criminal enterprise run out of the State Department," suggesting that she had sold valuable access to those who donated to her family's Clinton Foundation.