Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonBiden to debate for first time as front-runner Top Trump ally says potential Amash presidential bid could be problematic in Michigan Chaotic Trump transition leaks: Debates must tackle how Democrats will govern differently MORE on Tuesday unloaded an attack on Donald TrumpDonald John TrumpNew EPA rule would expand Trump officials' powers to reject FOIA requests Democratic senator introduces bill to ban gun silencers Democrats: Ex-Commerce aide said Ross asked him to examine adding census citizenship question MORE, going after the businessman-turned-presumptive Republican presidential nominee for his past comments looking forward to a housing market crash.

"He actually said he was hoping for the crash that caused hard-working families in California and across America to lose their jobs," Clinton said at a campaign event outside Los Angeles, according to The Wall Street Journal. “All because he thought he could take advantage of it to make some money for himself.”

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"How cruel do you have to be to actually root for a crisis that would devastate millions of families, all to pad your own pockets?" Clinton added on Tuesday afternoon in one of a series of tweets. "We need a president who's fighting to raise incomes for all Americans, not one who tries to profit at their expense."

Clinton's campaign released an ad noting that millions of Americans lost their homes and jobs as a result of the housing market crash in 2008. The ad included audio of Trump from 2006 that was unearthed last week in which the businessman says he was almost hoping for the housing bubble burst. 

"I sort of hope that happens because then people like me would go in and buy," Trump said in the 2006 audiobook for his now-defunct Trump University that was published by CNN. "If there is a bubble burst, as they call it, you know, you could make a lot of money."

Clinton surrogates in Ohio and Florida went after Trump's comments in a conference call with reporters, according to reports, and her campaign held related events in several battleground states, including Virginia and Pennsylvania, as Clinton looks to compete with Trump for working-class voters. 

Rep. Dina Titus (D-Nev.), a Clinton backer, also slammed Trump on the House floor, calling on the real estate magnate to apologize for similar comments in 2007, when he told students to view the housing bubble as an investment opportunity.

"We say to Mr. Trump: Keep your short fingers out of the Nevada housing market,” she said.

Trump defended his past remarks in a statement released by his campaign on Tuesday evening in response to the attacks, characterizing his comments as coming out of his experience in business while promising that "our jobs market will flourish" if he is elected president while traditional politicians "don't have a clue" about how to turn things around.

"I am a businessman and I have made a lot of money in down markets, in some cases as much as I've made when markets are good," Trump said. "Frankly, this is the kind of thinking our country needs — understanding how to get a good result out of a very bad and sad situation."

Clinton took another shot at Trump after he released the statement, which came a day after Trump ratcheted up his rhetoric against the Clintons while going after decades-old allegations. 

"Trying to profit off of people losing their homes isn't the 'kind of thinking our country needs,'" Clinton said in a tweet.