President Trump on Thursday announced Sen. Markwayne Mullin (R-Okla.) as his pick to take over as Homeland Security Secretary, replacing Kristi Noem, who has been given a new position. The big picture: Rather than outright firing top appointees, Trump has opted in his second term to shuffle them into new roles — a contrast with the record number of firings in his first administration. While announcing her departure from DHS on Thursday, Trump praised Noem's tenure, saying she "has had numerous a...