Milwaukee, July 12 -- Democratic presidential candidates promised major changes to U.S. immigration law Thursday, contrasting their ideas to the hardline policies of President Donald Trump during a forum with Latino political activists in Milwaukee.

The White House hopefuls gathered as Trump's detention policies have sparked fierce Democratic pushback and intense public debate. They uniformly panned Trump's approach to immigration on a day when the president abandoned his contentious effort to add a citizenship question to the 2020 census.

Sen. Elizabeth Warren drew one of the biggest audience reactions of the night when asked about the issue.

"Wow, he's going to follow the law?" Warren said to laughter and applause. "This is not about...