The Trump administration is stepping up efforts to curb legal immigration, taking a series of actions in recent weeks that could lead to deportation for people already granted citizenship. The administrative changes highlight how Trump officials, including Attorney General Jeff Sessions and White House adviser Stephen Miller, aren’t just seeking to curtail illegal immigration — they’re also taking steps against naturalized citizens in an effort to reduce the number of foreign-born residents in the U.S. Immigration experts say the changes — along with the agency’s new mission statement emphasizing the security of U.S. citizens — mark a noticeable shift in an agency that was previously focused on customer service.