An aide to Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE on Friday fulfilled the businessman's threat to "spill the beans" on Republican presidential rival Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE's wife, Heidi.

Trump spokeswoman Katrina Pierson rattled off a list of attacks three days after Trump first made the threat.

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"Spilling the beans is quite simple when it comes to Heidi Cruz," Pierson said in an interview with MSNBC's Steve Kornacki.

"She is a Bush operative; she worked for the architect of NAFTA, which has killed millions of jobs in this country; she was a member on the Council on Foreign Relations who — in Sen. Cruz's own words, called a nest of snakes that seeks to undermine national sovereignty; and she's been working for Goldman Sachs, the same global bank that Ted Cruz left off of his financial disclosure," Pierson said.

"Her entire career has been spent working against everything Ted Cruz says that he stands for," she added.

Cruz spokeswoman Alice Stewart responded to the remarks in a statement to The Hill, saying, "There's no low the Trump campaign won't go."

Ted Cruz has repeatedly slammed Trump for attacking his wife, describing Trump on Thursday as a "sniveling coward" and telling the businessman to "leave Heidi the hell alone."

Earlier in the MSNBC interview, Pierson said "this isn't about Heidi Cruz, this is about Melania Trump. Melania Trump was the one that was attacked."

Trump's campaign has pointed to an ad in Utah earlier this week from an anti-Trump super-PAC that showed Melania Trump posing nude from a magazine photo shoot in January 2000.

Cruz has denied any connection to the group or the ad, though Trump's campaign has attempted to continue linking him to it, noting that the ad also encouraged voters to support Cruz in the three-man GOP race.

The feuding between the candidates over their wives escalated late Wednesday when Trump shared a tweet with an unflattering image of Heidi Cruz juxtaposed with his wife Melania, a former model. The image was captioned, "a picture is worth a thousand words."

The retweet stirred a backlash on social media, including a pointed response from Fox News anchor Megyn Kelly, with whom Trump has feuded for months. "Seriously?" she tweeted.