Donald Trump unleashed on Hillary Clinton at his rally on Thursday, hours after her presidential campaign launched a new ad linking him to white supremacist movements.

"The news reports are that Hillary Clinton is going to try to accuse this campaign, and the millions of decent Americans who support this campaign, of being racists — which we're not," Trump told the crowd at his latest campaign stop in Manchester, N.H.

"It's the oldest play in the Democratic playbook," he said.

The Republican presidential hopeful, who recently began reaching out to black voters in his stump speech, said he felt obligated to respond to Clinton's accusations "for the sake of all decent voters she is trying to smear."

"When Democratic policies fail, they're left with one argument: 'You're racist. You're racist. You're racist,'" Trump charged. "It's the same old disgusting argument and it's so totally predictable.

"They're failing so badly," he said of Clinton and her allies, claiming their latest attacks are "the last refuge of the discredited Democrat politician."

Trump suggested Clinton, who is expected to deliver a speech about the alt-right's support for him later Thursday afternoon, has gone too far by characterizing him and his supporters as prejudice.

"Hillary Clinton isn't just attacking me, she is attacking all of the decent people of all backgrounds who support this incredible, once-in-a-lifetime movement," he said. "We can't let that stand."

To the former secretary of state and the donors and campaign advisers who are "pushing her to spread her smears and her lies about decent people, I have three words," Trump told the audience. "I want you to hear these words, and remembers these words: Shame on you.

"Shame on you," he repeated.