(WASHINGTON) — President Donald Trump on Thursday announced he’s nominating Michael Waltz to be U.S. ambassador to the United Nations, while Secretary of State Marco Rubio will serve as interim national security adviser while keeping his current role as well.

“I am pleased to announce that I will be nominating Mike Waltz to be the next United States Ambassador to the United Nations,” Trump wrote on his conservative social media platform. “From his time in uniform on the battlefield, in Congress and, as my National Security Advisor, Mike Waltz has worked hard to put our Nation’s Interests first. I know he will do the same in his new role.”

“In the interim, Secretary of State Marco Rubio will serve as National Security Advisor, while continuing his strong leadership at the State Department,” Trump continued. “Together, we will continue to fight tirelessly to Make America, and the World, SAFE AGAIN. Thank you for your attention to this matter!”

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Sources had told ABC News earlier Thursday that Waltz was expected to leave his post as national security adviser.

The move came as President Trump has been increasingly frustrated by Waltz after he came under intense scrutiny for inadvertently adding a reporter to a Signal chat with top Trump officials discussing a U.S. military strike on Houthi rebels in Yemen.

Waltz responded to Trump’s announcement on X, writing: “I’m deeply honored to continue my service to President Trump and our great nation.”

Rubio was a National Prayer Event at the White House earlier Thursday before the news broke. He was seen standing in the colonnade on his phone, and at times speaking with White House deputy chief of staff Stephen Miller.

State Department spokesperson Tammy Bruce learned about Rubio replacing Waltz in the middle of Thursday’s press briefing. She was being asked by reporters on whether Rubio would consider the position when Trump’s social media post came out.

“It is clear that I just heard this from you,” Bruce said as she reacted to the news in real time. She praised Rubio as “a man who, as I think you all know, has worn several hats from day one” and is “someone who is well known by the president.”

Bruce said the move was not “not entirely surprising,” but acknowledged “these last 100 days, it’s like hanging onto a freaking bullet train.”

Waltz was spotted doing a Fox News interview at the White House on Thursday morning, but was not present later on at the prayer event.

He was in attendance at Trump’s Cabinet meeting on Wednesday, where he offered praise for the president’s leadership and strength on the world stage during his first 100 days in office.

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Trump publicly defended Waltz in the aftermath of the March Signal mishap, telling NBC News the day after details came to light in an article by The Atlantic’s Jeffrey Goldberg that Waltz “has learned a lesson and is a good man.”

Trump was asked further about Waltz’s future by The Atlantic in an April 24 interview. He said Waltz was “fine” despite being “beat up” after accidentally adding Goldberg to the group chat.

Trump also said in that interview that Defense Secretary Pete Hegseth, who also came under fire for the Signal fiasco, was “safe.”

“I think we learned: Maybe don’t use Signal, okay?” Trump said about the controversy. “If you want to know the truth. I would frankly tell these people not to use Signal, although it’s been used by a lot of people. But, whatever it is, whoever has it, whoever owns it, I wouldn’t want to use it.”

This is a developing story. Please check back for updates.

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