When it comes to immigration, illegal movement isn't Donald Trump's only concern. He also wants legal immigration re-examined.
Trump said he'd welcome immigrants but would be selective in who's allowed into the United States, making sure they're vetted and come to contribute to the country.
"We will reform legal immigration to serve the best interests of America and its workers, the forgotten people. Workers. We're going to take care of our workers," Trump said in his 10-point immigration plan outlined in Phoenix in the summer of 2016.
WHY HE'S PROMISING IT
Controlling future immigration, Trump said, is needed to "ensure assimilation, integration and upward mobility."
Immigrants as a share of the national population are on the rise and set to break records, Trump claimed.
"We've been living under outdated immigration rules from decades ago. To avoid this happening in the future, I believe we should sunset our visa laws so that Congress is forced to periodically revise and revisit them," Trump said Aug. 31, 2016.
WHAT NEEDS TO HAPPEN
Trump proposed a new immigration commission that would create reforms to achieve four goals:
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Keep immigration levels, measured by population share, within historical norms (Trump did not specify his benchmark for historical norms, but some have estimated that the foreign-born share since 1850 on average has accounted for 10 percent of the U.S. population);
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Select immigrants based on their prospects to be "financially self-sufficient" and on their chances of success in American society;
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Select immigrants depending on their merit, skill and proficiency; and,
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Set new "immigration controls" to increase wages and to make sure available jobs are first made available to Americans.
WHAT'S STANDING IN HIS WAY
Congress sets rules regarding immigration, and legal immigration currently isn't as open as Trump may suggest. It's already limited qualitatively and quantitatively, said Stephen Legomsky, professor emeritus at Washington University School of Law in St. Louis and a former chief counsel at U.S. Citizenship and Immigration Services.
"Qualitatively, one may not legally immigrate unless, first, the person fits within one of the specific immigration categories established by Congress," Legomsky said.
Lawful permanent admission into the United States falls into four main categories: family reunification; people with desired, needed occupational skills; refugee protection; and country-of-origin diversity, noted a February 2016 Congressional Research Service report.
With a few exceptions, the law caps the number of people allowed annually under each of the qualifying categories and on the amount of people admitted from any one country, Legomsky said.
"Those caps have generated long waiting periods (typically several years) for most of the qualifying categories," Legomsky said.
POSSIBLE TIMELINE
Trump's goal of limiting legal immigration depends on support and swift action from Congress. Trump will take office with a Republican-led Congress, which may facilitate the keeping of this promise.