Former Oklahoma senator Markwayne Mullin has replaced Kristi Noem as Homeland Security secretary. Francis Chung/POLITICO/APKristi Noem was accused of using hundreds of millions of dollars of taxpayer funds for an ad campaign and private jets. After she was fired, her former right-hand man, Corey Lewandowski, was accused of attempting to personally profit from government contracts. His former right-hand woman, Kara Voorhies, is now under investig…