Sen. Markwayne Mullin, President Trump's choice to succeed Kristi Noem as Homeland Security secretary, testified at his confirmation hearing.

Markwayne Mullin is appearing before senators for a Department of Homeland Security confirmation hearing as President Donald Trump’s deportation push faces rising backlash

Republican Sen. Markwayne Mullin of Oklahoma had his confirmation hearing for Homeland Security secretary on Wednesday. CBS News homeland security correspondent Nicole Sganga has the details.

Sen. Markwayne Mullin, President Donald Trump’s nominee to lead the Department of Homeland Security, faced fellow senators on Wednesday at a confirmation hearing.

Oklahoma Sen. Markwayne Mullin faces a Senate committee Wednesday for his confirmation as Department of Homeland Security secretary.

If confirmed, he would replace outgoing Secretary Kristi Noem, who was fired earlier this month amid mounting criticism of her leadership of the Department of Homeland Security.

Markwayne Mullin, President Donald Trump's pick for Homeland Security secretary, will appear before senators Wednesday for his confirmation hearing. (AP Photo)

Sen. Markwayne Mullin appeared for his public confirmation hearing to serve as the secretary of Homeland Security after being tapped by President Donald Trump.