The appointment of Waltz and Noem, as well as possibly Rubio, come after Trump made Susie Wiles his chief of staff, named former immigration official Tom Homan as his "border tsar" and nominated New York Congresswoman Elise Stefanik as his future ambassador to the United Nations.

Florida Sen. Marco Rubio and South Dakota Gov. Kristi Noem are expected to be nominated by President-elect Donald Trump to be his secretary of state and secretary of Homeland Security, sources tell CBS News.

Former President Donald Trump, now the president-elect, is picking from his most loyal supporters as he builds his team for the White House and beyond.