President Donald Trump finally fired his long-embattled Homeland Security Secretary Kristi Noem, and panelists on "CNN This Morning" chewed over his nominee to replace her.The 79-year-old president tapped Sen. Markwayne Mullin (R-OK), who is probably best known for challenging Teamsters President Sean O'Brien to a fight during a Senate hearing, to lead DHS after firing Noem, and the panelists argued over the Oklahoma Republican's qualifications for the cabinet role."It's a different vibe," said...