Eliza Collins

USA TODAY

Donald Trump doesn't appear to have any plans to release his tax returns — and Hillary Clinton apparently isn't going to let up on him.

On Thursday, the Democratic nominee released a 30-second TV ad that featured an old clip of Trump saying he’d “absolutely” release his returns if he ever ran for office and Republicans speculating on what could be hiding in Trump’s returns.

“If I decide to run for office I’ll produce my tax returns — absolutely,” Trump says at the beginning of the ad.

The ad then has the word “Now?”

ABC’s George Stephanopoulos asks, “What is your tax rate?”

Trump responds, “It’s none of your business.”

The ad then plays clips of Republicans speculating on what could be inside Trump’s returns.

The Republican nominee has said that he won’t release his returns while they’re under audit. There are no regulations that prevent him from doing so, and his running mate, Indiana Gov. Mike Pence, has indicated he would release his tax returns.

Last week, both Hillary Clinton and her running mate, Virginia Sen. Tim Kaine, released their returns in an attempt to pressure Trump to do the same.

Meanwhile, the Democratic National Committee announced Thursday it would be sending "Donald ducks" to a series of Trump events. The duck went to Trump Tower on Thursday and will be at Trump rallies in the following days.

In a release, the DNC said the character was set to call out Trump for "constant ducking on his taxes." But the DNC isn't the first one to play off Trump's first name; it is a bipartisan affair. During the primaries, Texas Sen. Ted Cruz released a snapchat filter that featured "Ducking Donald" based off Trump skipping a debate.