Now the Trump administration wants to limit citizenship for legal immigrants

The most significant change to legal immigration in decades could affect millions of would-be citizens, say lawyers and advocates. The Trump administration is expected to issue a proposal in coming weeks that would make it harder for legal immigrants to become citizens or get green cards if they have ever used a range of popular public welfare programs, including Obamacare, four sources with knowledge of the plan told NBC News.The move, which would not need congressional approval, is part of White House senior adviser Stephen Miller's plan to limit the number of migrants who obtain legal status in the U.S. each year.Details of the rulemaking proposal are still being finalized, but based on a recent draft seen last week and described to NBC News, immigrants living legally in the U.S. who have ever used or whose household members have ever used Obamacare, children's health insurance, food stamps and other benefits could be hindered from obtaining legal status in the U.S.