pits newsom in another and more personal fight with trump, as california dives into the trump tax battle. federal government is not able for tors his hand, california will. reporter: state senator mike mcgwire introduced the bill and saying it s all about presidential transparency. if you re a democrat or a republican, you can choose not to release your tax forms, but you simply won t be on the california ballot. reporter: there s one person who vehemently resisted releasing his tax returns. we all know that s hog wash. reporter: four years trump has refused to budge. i would love to give them, but i m not going to do it. it s very simple. reporter: to force trump hand s states are jumping in. this year, states introduced similar bills, california is expected to face legal challenges but democrats say they re not worried. this bill applies to all
island that can get rid of corruption. very much a lot of uncertainty still, on the island of puerto rico, as they figure out what s next for the island. in san juan, puerto rico, leyla santiago, cnn. thank you. the u.s. president once promised to reveal his tax returns. but since taking office, he has fought to keep them hidden. a new law in california, however, may force him to reveal all, and if he doesn t it could cost him millionsing of votes in the next election. our kyung lah has the story. reporter: the latest battle for president trump s taxes. governor gaffen newsom signed a bill that requires presidential and gubernatorial candidates to release their tax returns in order to qualify for the state s 2020 primary ballot. you have a right as an american citizen what s going on. you have a right to know. reporter: this latest move