Donald TrumpDonald TrumpEx-DOJ official Rosenstein says he was not aware of subpoena targeting Democrats: report Ex-Biden adviser says Birx told him she hoped election turned out 'a certain way' Cheney rips Arizona election audit: 'It is an effort to subvert democracy' 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 CruzBiden tries to erase Trump's 'America First' on world stage Cotton, Pentagon chief tangle over diversity training in military GOP senators press Justice Department to compare protest arrests to Capitol riot 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.