President Donald Trump’s move to fire Homeland Security Secretary Kristi Noem and tap Sen. Markwayne Mullin, R-Okla., as her replacement triggered a domino effect in Congress. Before Mullin can take the helm of the Department of Homeland Security (DHS), he has to be confirmed. And once confirmed, someone will have to take his seat. Both caveats come with their own hurdles. Senate Democrats may try to toss a wrench into the confirmation process and extract...










