Mike Waltz

Trump said he would make Secretary of State Marco Rubio his interim national security adviser. It's the first time since the Nixon era that one person will do both jobs.

Waltz, who represented a House district covering parts of Northeast Florida, is the most prominent senior administration official to depart since President Donald Trump returned to the White House.

A slate of congressional hopefuls are vying to win their Florida primaries in special elections to replace two high-profile House Republicans. Holding onto the reliably conservative seats could maintain the Republicans’ narrow House majority as they try to approve President Donald Trump’s agenda.