The White House had not been happy with Kristi Noem for quite some time.Donald Trump booted the 54-year-old from her position atop the Department of Homeland Security Thursday following a string of abysmal appearances this week before Congress. But the hearings, as it turns out, were just the straw that broke the camel’s back for Noem’s tenure in the executive branch.Her position among the higher echelons of the Trump administration had become increasingly tenuous in recent months, most notably...