Hillary Clinton is Ready to Take Aim at Donald Trump

The former Secretary of State releases new video targeting the presumptive GOP nominee.
5:21 | 05/15/16

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Transcript for Hillary Clinton is Ready to Take Aim at Donald Trump
It's been a tough couple of days for Donald Trump, from refusing to release his tax trourns the so-called trump tapes. And now, Hillary Clinton is trying to take advantage in a new ad. Mary Bruce is here with the story. Mary, good morning to you. Reporter: Good morning. Trump is making an extremely rare move here. Breaking precedent by refusing to release his tax returns. This morning, Clint season seizing on it and turning up the heat. Thank you. Reporter: This morning, Hillary Clinton is slamming Donald Trump for refusing to release his tax returns, asking in this new video, what is he hiding? If I decide to run for office, I'll do it. I can't do it until the audit is finished. Yes, or no, do you believe veerts have a right to see your tax returns before they make a final decision? I don't think they do. But I do say this. I'll gladly give them. It's under routine audit. Reporter: Until then, he says he won't reveal how much he pays in tax. What is your tax rate? It's none of your business. You'll see it when I release. I fight very hard to pay as little tax as possible. The commercial is effective. He uses Donald Trump's own words. Reporter: This, as trump is haunted by a voice from his past. What's your name again? John miller. Reporter: The person on the other end of the call tells us she knew before she hung up, this was trump. No doubt, the real Donald Trump. No doubt. He apologized two weeks later and said so in print. Reporter: Sue was a reporter for "People" magazine in 1991 when she conducted this interview with someone who claimed to be trump's spokesman. She's somebody that has a lot of options. He gets called by everybody in the book, in terms of women. Reporter: She says weeks later, he called her and admitted it was him all along. Part of me was like, sit Donald? I think sit. It tells you about his character. He's punking me. He's punking the country. Reporter: You think it shows he's a liar? Yes. Reporter: She says she did not leak this recording to the press. She suggests trump may have released it himself to divert attention from the other issues dogging his run, like tax returns. Let's bring in Jon Karl, in Washington, getting ready to host "This week." Hillary Clinton is hitting Donald Trump on his refusal to release his taxes? Isn't it a bit dangerous given that some have called on her to release her speeches to wall Street? Think the answer to both questions is yes. Sit a potent line of attack. Trump will be dogged from now to the election from people saying, what do you to hide? Hillary Clinton making the case in the debates, you can imagine. The minute she does, what do you have to hide? The question goes right back to her. Not just the transcripts of her speeches to Goldman Sachs. The e-mails that were deleted. The Clintons have had issues with the problem of transparency. Trump has, too. Welcome to the fall campaign. The front page of "The new York times" this morning called crossing the line, trump's private conduct with women. Polls say he's unpopular with women. Does he need to fix it? Could this article further the damage? Well, look, he does have a huge problem with women. Hillary Clinton begins this race with a double-digit huge gender gap lead. Among women. A lot of people look in the story at say, they have heard many of these stories before. They'll see how the New York times placed that front and center and say, there they go again. Those predisposed to trump, they've heard this before. They've heard worse. I'm not sure it changes the dynamic. He does need to find way to change the gender gap. On a lighter note, "Saturday night live" weighing in on reports that trump was his own publicist in the 1990s. Mr. Trump is the real-life inspiration for ironman. Who am I? I'm his publicist, joey pepperoni. This is what classy people sound like, okay? Joey pepperoni's lines are ringing off the hook this morning. Trump denies he ever pretended to be anybody else. Do you think people buy that? Does it matter? Since all the trump controversies tend to blur together? He's the ultimate teflon candidate, Dan. I don't know. You know, this is something else. He hasn't always denied it by the way. The court filing from back in the 1990s where he acknowledged using the name John baron on occasion. I don't know where this one goes. This is a thing that could lead to ridicule. One thing he hates is to be rid could. Jon will be part of bag show this morning. He'll interview the head of the republican party. And Martha Raddatz will be live from Iraq.

This transcript has been automatically generated and may not be 100% accurate.

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