Jennifer Arangio, a top National Security Council official, was let go this week after a conflict with White House aide Stephen Miller and others over the administration's immigration policy, reports Politico.

The big picture: NSC head John Bolton has cleaned house since his arrival as national security advisor in March. Arangio was ousted just two days after Joel Rayburn and Michael Bell, two senior officials working in the NSC's Middle East section, were removed.