Stephen Miller Emerges as Top Contender for National Security Adviser

President Trump's top policy adviser, Stephen Miller, is garnering buzz inside the White House as a top candidate to be the next national security adviser, five sources familiar with the situation say.

Miller — the deputy chief of staff and the brain behind Trump's controversial immigration crackdown — is one of the president's longest-serving and most-trusted aides.

Miller's name surfaced shortly after Trump removed Mike Waltz as national security adviser on Thursday and nominated Waltz to become the next United Nations ambassador.

Secretary of State Marco Rubio is temporarily taking over Waltz's responsibilities, but sources familiar with his thinking say he's busy enough running the State Department.

Miller already is the administration's Homeland Security adviser, and is an aggressive defender of the administration's legal push for immediate deportations of unauthorized immigrants without court hearings.

One White House source told Axios via text that Miller has made the Homeland Security Council run "like clockwork," and that it's "infinitely more effective than the NSC [National Security Council] with a tiny fraction" of the staff.

Trump has a penchant for putting his faith in a small number of advisers and piling responsibilities on their plate, so insiders say it wouldn't be unusual for Miller hold multiple titles, just as Rubio does.

"Marco and Stephen have worked really closely on immigration and it might be a perfect match," said another White House source.

"Given how well he's worked with Marco, many see him as the perfect person to restore the role of the NSA to a staff-level policy role that reports to the chief of staff, instead of some inflated Cabinet position," said another insider.

A fourth source said Miller signaled interest in the job Thursday, but Miller couldn't be reached for comment to confirm.

A fifth source said Miller might not want the job "if it takes him away from his true love: immigration policy."

Those who understand the president's thinking say it's unclear how long he wants to keep Rubio as national security adviser.

But one of the administration sources said that "if Stephen wants the job, it's hard to see why Trump wouldn't say yes."