New Delhi, March 18 -- Senator Markwayne Mullin, President Donald Trump's pick for Secretary of Homeland Security, will appear before the Senate on Wednesday (March 18) for his confirmation hearing, where he will face questions on his vision for the department amid the administration's push for mass deportations.

Mullin, an Oklahoma senator with 13 years in Congress, is a close ally of President Trump. If confirmed, he would replace Kristi Noem, who was fired earlier this month following mounting criticism of her leadership of the Department of Homeland Security (DHS).

Mullin is a former mixed martial arts fighter and plumbing business owner. He has previously expressed support for immigration enforcement operations and is expected to a...