Markwayne Mullin faces a final Senate confirmation vote Monday to lead the Department of Homeland Security following the removal of Kristi Noem.The Oklahoma Republican and close ally of Donald Trump takes the position as the department experiences a funding shutdown causing travel delays.Mullin pledged to implement immigration reforms, including judicial warrants for home entries, while supporting the administration's mass deportation agenda.His leadership begins amid internal pressure to reform the Federal Emergency Management Agency and address tensions after recent protest deaths.