WASHINGTON (AP) — Secretary of State Marco Rubio has been thrown into two top national security jobs at once as President Donald Trump presses forward with his top-to-bottom revamp of U.S. foreign policy, upending not only longstanding policies that the former Florida senator once supported but also the configuration of the executive branch.

Trump’s appointment of Rubio to temporarily replace Mike Waltz as national security adviser is the first major leadership shake-up of the nascent administration, but Waltz’s removal had been rumored for weeks — ever since he created a Signal group chat and accidentally added a journalist to the conversation where top national security officials shared sensitive military plans.

So, just over 100 days into his tenure as America’s top diplomat, Rubio now becomes just the second person to hold both positions. He follows only the late Henry Kissinger, who served as both secretary of state and national security adviser for two years under Presidents Richard Nixon and Gerald Ford in the 1970s.

Rubio — a one-time Trump rival and hawkish conservative who was derided by the president as “Little Marco” during the 2016 presidential campaign — has proven adept at aligning himself with Trump’s “America First” foreign policy positions. Rubio has largely eschewed his staunch advocacy of providing foreign aid and promoting democracy overseas since taking over the State Department, repeating a refrain that every policy or program should make America safer, strong