President Trump said on Saturday that he was nominating Tammy Bruce, a spokeswoman for the State Department, as the next deputy representative of the United States to the United Nations.

Mr. Trump said on Truth Social that Ms. Bruce had done a “fantastic job” in her State Department role and that she would “represent our Country brilliantly at the United Nations.”

Ms. Bruce has served as the State Department’s spokeswoman since January and has conducted regular press briefings on U.S. foreign policy. She has defended the Trump administration’s response to Israel’s war in Gaza, as well as its decisions to withdraw from UNESCO, the U.N. cultural agency, and to freeze nearly all U.S. foreign aid funded by the United States Agency for International Development and the State Department.

“I’m blessed that in the next few weeks my commitment to advancing America First leadership and values continues on the global stage in this new post,” Ms. Bruce said on X after the announcement.

Ms. Bruce was a political commentator and a contributor to Fox News for more than 20 years before joining the Trump administration. She had been a longtime organizer for the Democratic Party before breaking away to “expose and help defeat the leftist agenda,” according to her website. She has written several books criticizing the American left.

Her nomination for the role, which requires Senate confirmation, comes weeks after the confirmation hearing of Michael Waltz, Mr. Trump’s former national security adviser, to serve as U.S. ambassador to the U.N.

Mr. Trump nominated Mr. Waltz in May after Mr. Waltz stepped down from the national security role, where he faced intense scrutiny earlier this year for a group chat on Signal in which senior officials discussed sensitive details of a military operation in Yemen. His nomination is still awaiting Senate confirmation.