Ahead of a potential campaign announcement, Mr. Bloomberg, the billionaire businessman and former mayor of New York City, is beginning a $100 million digital campaign designed to attack and define President Trump in the top battleground states seen as likely to decide the 2020 election, reports The New York Times.

The ads will go online on Friday in four states — Arizona, Michigan, Pennsylvania and Wisconsin — and run through the end of the primary season, even if Mr. Bloomberg is not in the race.