Ms. Warren’s plan — like those advanced by the former housing secretary Julián Castro and former Representative Beto O’Rourke — seeks to reverse what she calls “bigoted” policies imposed by the Trump administration; expand pathways to citizenship for immigrants; and spend more on aid to Central America to help address the root causes of migration.

[We asked the Democratic presidential hopefuls whether illegal immigration was a major problem. Watch them answer.]

“Donald Trump wants to divide us — to pit worker against worker, neighbor against neighbor,” Ms. Warren wrote. “We can be better than this. Americans know that immigrants helped weave the very fabric of our country in the past — and they know that immigrants belong here today.”

Ms. Warren said she would aim to resettle 125,000 refugees in the United States in her first year in office, and at least 175,000 per year by the end of her first term. That would be a substantial increase from the levels under the Trump administration, which has said it will cap the number at 30,000 this year. It would also go beyond the annual cap of 110,000 refugees that President Barack Obama put in place before he left office.

The plan also codifies Ms. Warren’s support for repealing the section of immigration law that makes illegal border crossings a criminal violation and that has enabled the Trump administration to separate parents and their children. Under her plan, unauthorized crossings would be a civil violation and prosecutors would “prioritize immigration cases with security concerns.”