TRENTON -- Donald Trump on Wednesday unleashed a blistering attack on Hillary Clinton, calling his opponent a "world-class liar" and alleging that she abused her post as U.S. secretary of state for personal gain while allowing terrorism to spread.

"Hillary Clinton may be the most corrupt person ever to seek the presidency," Trump, the presumptive Republican presidential nominee, said of Clinton, the presumptive Democratic nominee, in a speech in New York City.

The speech comes one day after Clinton delivered an address of her own saying that a Trump presidency would lead the U.S. into another recession, bankrupting America like it was "one of his failed casinos" in Atlantic City.

It also comes as Trump fights back from a tumultuous stretch in his campaign, during which he drew controversy for comments he made about a judge's ethnicity and his call for a temporary Muslim immigration ban, saw his poll numbers against Clinton drop, and fired his campaign manager.

Trump lashed out at Clinton on a number of fronts, including the email scandal that has plagued her campaign, her debunked claim that she came under sniper fire while landing in Bosnia in 1996, and the 2012 attack in Benghazi, Libya, that left an American ambassador dead.

The billionaire real estate mogul also accused Clinton -- who served as secretary of state from 2009 to 2013 -- of helping create a atmosphere in the Middle East that led to the creation of terrorist group the Islamic State, or ISIS.

"Her decisions spread death, destruction and terrorism everywhere she touched," the billionaire real estate mogul said.

Trump said Clinton may be disqualified from even becoming president because the emails on the controversial private server she kept while secretary of state may have have been hacked by America's enemies -- a claim that hasn't been substantiated.

"While we may not know what is in those deleted emails, our enemies probably know every single one of them," he said.

Trump said Clinton has "perfected the politics of personal profit and even theft," accusing her of using her position as secretary of state to solicit contributions to the Clinton Foundation and of accepting money from foreign countries that mistreat women and gays.

"She ran the State Department like her own personal hedge fund," he said.

Trump accused Clinton of making $21.6 million by giving speeches to Wall Street executives but refusing to release the transcripts.

He slammed Clinton for backing the Trans-Pacific Partnership, even though she now says she opposes it. And he said her support of free trade policies would cause the U.S. to lose jobs and raise taxes.

"We will lose everything," he said. "We will lose our country."

Trump also mocked Clinton's campaign slogan, "I'm with her."

"You know what my response to that is? I'm with you -- the American people," he said.

Clinton responded shortly after Trump finished with a post on Twitter:

This is what real leadership looks like. https://t.co/4Nh6QpqSxL — Hillary Clinton (@HillaryClinton) June 22, 2016

Clinton campaign spokesman Glen Caplin dismissed Trump's speech, according to a report by NPR.

"While Hillary Clinton lays out her vision for an America that is stronger together with an economy that works for everyone and not just those at the top, Donald Trump can't help himself from rehashing and recycling more tired and old nonsense from books that already have been debunked," Caplin said. "Rather than coherently defend his record or his plans, Trump will instead resort to peddling yet more discredited attacks from his 'look over there' campaign playbook."

Correct the Record, a group that defends Clinton, said Trump's speech included "outright lies" and accused him of repeating "conspiracy theories instead of actual facts," according to the NPR report.

Brent Johnson may be reached at bjohnson@njadvancemedia.com. Follow him on Twitter @johnsb01. Find NJ.com Politics on Facebook.