Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE's new campaign manager, Kellyanne Conway, called for Trump to release his tax returns in April, according to CNN video highlighted by Media Matters.

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Then head of a super-PAC supporting Trump rival Ted CruzRafael (Ted) Edward CruzWhatever you think the Alabama special election means, you’re probably wrong This week: Congress gets ball rolling on tax reform Week ahead: Senators work toward deal to fix ObamaCare markets MORE, Conway was asked in an April 25 CNN interview if the "alliance" between John Kasich and Ted Cruz was fair. "Of course it's fair game," she said. "Oh absolutely. It's completely transparent. Donald Trump's tax returns aren't, and I would like to see those be transparent."

Conway, a veteran GOP pollster who was hired by Trump on July 1 and became his campaign manager this week, has also criticized the GOP presidential nominee on a number of other important issues.

On Feb. 10, Conway blasted Trump's claim that he is "for the little guy," questioning his business ethics.

Trump "actually built a lot of his business on the backs of the little guy” she said on CNN, adding that Trump is known for “not paying contractors after [they have helped him] build something."

She also sharply critiqued the businessman in the past over Trump University, his use of personal insults, and simply "saying things that aren't true," the left-leaning group said.

A number of other top Republicans have also blasted Trump for not releasing his tax returns.

"Either he's not anywhere near as wealthy as he says he is [or] there's a bombshell in Donald Trump's taxes," said the former Republican nominee Mitt Romney.