What to know about Markwayne Mullin's confirmation hearingSen. Markwayne Mullin, a Republican from Oklahoma, appeared before the Senate Homeland Security & Governmental Affairs Committee for a confirmation hearing Wednesday on his nomination to replace Homeland Security Secretary Kristi Noem, following months of criticism over her handling of mmigration enforcement operation. The committee could vote as soon as Thursday.Sen. Rand Paul kicked off the hearing by challenging Mullin for allegedly calling him a "freaking snake" and claiming "I understand why his neighbor did what he did," referring to when a neighbor attacked Paul in 2017 and caused serious injuries. Mullin responded by saying, "It seems like you fight Republicans more than work with us." Democratic Sen. Gary Peters pressed Paul about an overseas trip in 2015. Mullin repeatedly insisted it was classified and he could only detail the trip in a secure location.…