President-elect Donald Trump is naming longtime adviser Stephen Miller, an immigration hard-liner, to be deputy chief of policy in his new administration. Confirming the appointment, Vice President-elect JD Vance posted a message of congratulations on Monday to Miller on X and said, "This is another fantastic pick by the president." Miller is one of Trump's longest-serving aides, dating back to his first campaign for the White House. He was a senior adviser in Trump's first term and has been a central figure in many of his policy decisions, particularly on immigration, including Trump's move to separate thousands of immigrant families as a deterrence program in 2018. Miller has also helped craft many of Trump's hard-line speeches. Since leaving the White House, Miller has served as the president of America First Legal, an organization of former Trump advisers fashioned as a conservative version of the American Civil Liberties Union. Because it is not a Cabinet position, the appointment does not need Senate confirmation.