Trump ousts White House national security adviser Waltz

U.S. President Donald Trump ousted his national security adviser Mike Waltz on Thursday and named Secretary of State Marco Rubio as his interim replacement.

Trump, in a social media post, said he would nominate Waltz to be the next U.S. ambassador to the United Nations.

Citing multiple sources, Reuters reported earlier that Trump had decided to remove Waltz from his national security post. Waltz had faced criticism inside the White House, particularly after he was caught up in a March scandal involving a Signal chat among top Trump national security aides.

Rubio will be the first person since Henry Kissinger in the 1970s to hold the positions of secretary of state and national security adviser simultaneously, according to Reuters.

"When I have a problem, I call up Marco. He gets it solved," Trump said at a White House event earlier on Thursday, according to Reuters.

A person familiar with the matter told Reuters Trump wanted to get to the 100-day mark in his term before firing a cabinet-level official.

The national security adviser is a powerful role that does not require Senate confirmation.