India, March 6 -- President Donald Trump dismissed his beleaguered Homeland Security Secretary Kristi Noem and announced his intention to nominate Oklahoma Republican Senator Markwayne Mullin as her successor.

Trump made the announcement via social media on Thursday, just two days after Noem endured intense questioning from both GOP members and Democrats on Capitol Hill.

Trump stated that he would appoint Noem as a "Special Envoy for The Shield of the Americas," a new security initiative aimed at addressing issues in the Western Hemisphere.

Noem becomes the first Cabinet secretary to exit during Trump's second term. Her departure concludes a challenging period in which she managed immigration enforcement strategies that faced significa...