Trump goes to Pennsylvania with eyes on Joe Biden, Pete Buttigieg

The mayor brushed off the president's attacks in a Fox News town hall, bringing the crowd to its feet and causing the president to lash out on Twitter.
3:00 | 05/20/19

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Transcript for Trump goes to Pennsylvania with eyes on Joe Biden, Pete Buttigieg
There is a breaking headline involving president trump tonight. A judge has ruled that his long-time accounting firm must turn over those financial this has the president heads to Pennsylvania tonight, where Joe Biden is from. The president making it very clear that he believes Biden is his biggest threat. Here's ABC's senior white house correspondent Cecilia Vega tonight. Reporter: With his supporters lining up to see him, tonight, president trump heads to Pennsylvania with one man in mind, democratic front-runner Joe Biden. The president tweeting that he's in the white house because of Biden, and "The man who took him off the 1% trash heap, president O." Trump won Pennsylvania by just one point. Biden just held his first rally there. If you want to know what the first and most important plank in my climate proposal is -- beat trump. Beat trump. Beat trump. Reporter: Some Democrats frustrated by Biden's momentum. Senator kamala Harris has faced questions about whether she'd be Biden's running mate. She says he's the one who would make a great number two. I think that Joe Biden would be a great running mate. As vice president, he's proven that he knows how to do the job. Reporter: Also grabbing the president's attention, southbend mayor Pete buttigieg. President trump mocking his age on Twitter. Buttigieg is 37. How would you handle insults and attacks and tweets and all of that that? The tweets are -- I don't care. Reporter: Buttigieg brushing off the president's attacks in a Fox News town hall, bringing the crowd to its feet. Thank you, mayor, and thank you -- wow, a standing ovation. All right. Thank you, mayor. Reporter: President trump didn't like that, tweeting, "Hard to believe Fox News is wasting air time on mayor Pete." Let's get to Cecilia, live at the white house tonight. And Cecilia, the president as he heads to Pennsylvania, is likely aware that the federal judge has ruled that his financial firm has required the documents being handed over. Reporter: This is really being seen as a test case as they refuse to comply with a growing list of subpoenas. The judge ruled ten years of records must be handed over. The president just a few minutes ago, weighed in right here at the white house, he called this, quote, totally the wrong decision by an obama-appointed judge. He's vowing to appeal. And Cecilia, one more question. Don mcgahn was subpoenaed to testify, that was supposed to be tomorrow, but the white house telling mcgahn to defy that subpoena? Reporter: Exactly. The white house says they are calling for this over constitutional precedent, to protect future administrations, but Democrats, you know have, have a lot to talk to mcgahn he was mentioned more than any other witness in the Mueller report. As for what mcgahn does next, he said he would follow the white house's instructions. Cecilia, thank you. Next here, to the abortion battle in this country, now widening tonight.

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

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