Former New York City mayor files to run in Alabama's presidential primary

Billionaire Michael Bloomberg, an active proponent of gun control, has yet to confirm if he plans to run for president but reportedly considers Trump "an unprecedented threat to our nation."
1:49 | 11/08/19

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Transcript for Former New York City mayor files to run in Alabama's presidential primary
Good evening and it's great to have you with us here on a Thursday night. And we begin tonight with that developing headline. A potential shakeup in the race for president. Tonight, former New York City mayor Michael Bloomberg. Is he about to run? This evening, the billionaire businessman and the major signal he might soon be in, filing to run in at least one state's presidential primary just before an approaching deadline. If he runs, what could this mean for Joe Biden and Elizabeth Warren? And Michael Bloomberg has a long history with his fellow New York businessman, president trump. ABC's Mary Bruce leading us off tonight. Reporter: Tonight, Michael Bloomberg is sending a jolt through the presidential race. ABC news has confirmed the billionaire plans to file paperwork tomorrow, putting his name on the democratic primary ballot in Alabama. Bloomberg, a centrist who has become an active promoent of gun reform, is an outspoken critic of president trump. I'm a new Yorker, and I know a con when I see one. Reporter: A top adviser says the former mayor considers the president an unprecedented threat to our nation. But Bloomberg's possible plan to enter the campaign comes amid mounting questions about whether the leading democratic candidates, Joe Biden and Elizabeth Warren, have what it takes to defeat Donald Trump. Well, if true, this certainly would be a shakeup. Mary Bruce live in Washington tonight. And Mary, we know Michael Bloomberg has laid the groundwork here for a presidential campaign, with this initial paperwork, just before this deadline, but tonight, he hasn't yet officially decided whether he's going to run? Reporter: Well, David, Bloomberg aides tell us he is simply keeping his options open here, filing this paperwork that would allow him to run if he decides to. But we are already getting reaction from the campaign trail tonight. Bernie Sanders' campaign saying, quote, more billionaires seeking more political power surely isn't the change America needs. David? The first reaction already coming in. Mary, thank you.

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

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