One of U.S. President Donald Trump's main promises on the 2016 campaign trail was to limit both illegal and legal migration. Nearly a year into his tenure, immigration reform is indeed shaping up to be a domestic priority for the Trump administration. The White House presented Congress an extensive list of reform demands in October 2017, which have been whittled down to form the basis of negotiations in the legislature. But as with many of Trump's other bold campaign promises, overhauling the U.S. immigration system will be easier said than done . The Long Journey to Today At its core, Trump's administration is pushing for a more selective, restrictive system for admitting migrants to the country, based on the argument that such a system would increase national security and reduce competition for U.S. workers.