GOP presidential candidate Sen. Ted CruzRafael (Ted) Edward CruzSinger Leon Bridges to join Willie Nelson in performing at O’Rourke rally Election Countdown: Trump confident about midterms in Hill.TV interview | Kavanaugh controversy tests candidates | Sanders, Warren ponder if both can run | Super PACs spending big | Two states open general election voting Friday | Latest Senate polls Poll: Beto O'Rourke leads Cruz by 2 points in Texas Senate race MORE (Texas) said Sunday that rival Donald TrumpDonald John TrumpLondon terror suspect’s children told authorities he complained about Trump: inquiry The Memo: Tide turns on Kavanaugh Trump to nominate retiring lawmaker as head of trade agency MORE may be withholding his tax returns because of dealings with the Mafia.

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In two interviews on Sunday, Cruz repeatedly pressed the Republican front-runner to release his latest tax information and said Trump might be holding back because of his “business dealings with the mob.” Cruz cited reports that Trump’s company has worked with “major New York crime families,” including the jailed "Fat Tony" Salerno.

“There have been multiple media reports about Donald's business dealings with the mob, with the Mafia. Maybe his taxes show those business dealings are a lot more extensive than has been reported,” Cruz said in an interview with NBC News’s “Meet the Press.”

Trump has faced heavy pressure from his GOP critics to release tax returns this week, after former GOP presidential nominee Mitt Romney warned the documents could contain a “bombshell."

“The fact that he's refusing to do so really suggests, as Mitt Romney pointed out, that there may be a bombshell in there, that there's something he's hiding,” Cruz said on ABC’s “This Week."

Cruz also quipped that Trump may be withholding his documents because “maybe, the fact is that Mitt Romney is richer than Donald Trump.”

When asked about the issue in a separate "Fox News Sunday" interview, Trump would not say why he has not released his returns. Instead, he said news outlets could read the financial documents he disclosed with the Federal Election Commission (FEC).

“Go down to the FEC and take out my documents,” Trump told Fox News host Chris Wallace.

Trump has said his 92-page filing shows he is worth $10 billion. But presidential disclosure filings have long been criticized as an imperfect way to calculate personal wealth. Candidates report the value of their assets in broad ranges, making the figures difficult to tally.