As the Democrats put the squeeze on the Republican presidential nominee, a new Clinton ad was released on Thursday that features clips of influential Republicans scrutinizing Donald Trump's decision to refrain from releasing his tax returns.

George Will, a conservative columnist, suggests, "Perhaps one more reason why we're not seeing his tax returns is because he is deeply involved in dealing with Russian oligarchs,"

"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 2012 Republican Presidential nominee Mitt Romney during an interview with Fox News.

The ad is the latest of a fusillade to keep Donald Trump's mysterious tax returns in the spotlight. His decision not to divulge his returns has led to skepticism about whether he is getting foreign investment or is paying below the appropriate tax rate.

Trump's reason for not releasing his tax returns is that the IRS has yet to complete the audit of his returns, which however, does not prevent him from releasing the records to the public.

The Clinton camp wants the issue with Trump's taxes to be showcased on the news. Hillary Clinton herself has been pushing the matter at rallies.

"Of course, we have no idea what tax rate he pays - because unlike everybody else who's run for president in the last four or five decades, he refuses to release his tax returns," Clinton said last Wednesday, during a rally in Cleveland.

On Thursday, two U.S. senators, Ron Wyden and Chris Murphy, along with supporters of Hillary Clinton called for an assembly to push a bill called the Presidential Tax Transparency Act, which would mandate presidential nominees to release their tax returns.

Meanwhile, at Trump rallies nationwide and outside the Trump Tower in Manhattan, the Democratic National Committee has organized sneaky assaults where protestors are holding signs that say "Donald Ducks Releasing His Taxes" complete with a Duck mascot.