The president-elect said in a statement to ABC News, "I am honored to nominate Chairwoman Elise Stefanik to serve in my Cabinet as U.S. Ambassador to the United Nations. Elise is an incredibly strong, tough, and smart America First fighter."
Republican Rep. Stefanik, 40, won reelection to a U.S. House seat representing New York last Tuesday. She represents a largely rural northern New York district that includes some of the most sparsely populated parts of the state.
Stefanik who serves as House Republican Conference Chair, has long been one of Trump's most loyal allies in the House, and was among those discussed as a potential vice presidential choice.
Born and raised in upstate New York, Stefanik graduated from Harvard and worked in former President George W. Bush's White House on the domestic policy council and in the chief of staff's office.
In 2014, at 30, she became the youngest woman ever elected to Congress, representing upstate New York. She later became the youngest woman to serve in House leadership.
Stefanik was known early in her tenure as a more moderate conservative voice. But she soon attached herself to the former president, quietly remaking her image into that of a staunch MAGA ally - and seeing her power ascend.
Stefanik spent years positioning herself as one of Trump's most trusted allies and confidants on the Hill. She endorsed him in the 2024 race before he had even launched his bid, and aggressively campaigned on his behalf during the GOP primary.
She saw her profile rise after her aggressive questioning of a trio of university presidents over antisemitism on their campuses led to two of their resignations - a performance Trump repeatedly praised.
She also defended him vigorously in both of his impeachment trials and railed against his four criminal indictments, including filing an ethics complaint in New York against the judge who heard his civil fraud case.
Stefanik's appointment to the job comes despite her minimal experience in foreign policy and national security.
While she is a member of the House Armed Services Committee and serves on the coveted House committee that oversees national intelligence, her pick further solidifies Trump's preference for unconditional loyalty in his second administration over career experience.
One area of foreign policy that Stefanik has been vocal about is Israel.
Since the start of the Israel-Hamas war, Stefanik has focused much of her attention on the United Nations, accusing the world body and international organizations of antisemitism for their criticism of Israel's bombardment of Gaza, which has resulted in the death of more than 43,000 Palestinians, according to the group's Health Ministry.
She has gone as far as calling last month for a "complete reassessment" of U.S. funding for the United Nations. while helping push for the blocking of American support for the U.N. agency that provides humanitarian aid to Palestinians in the region.
Her departure for the United Nations will also mean that Republicans, who are on track to have a razor-thin majority in the House, will be down one crucial vote. But Stefanik's district is located in a deeply red part of upstate New York, where Republicans are likely guaranteed to win the special election that will take place after she leaves office.
"Republicans will hold this safe Republican seat as part of a Republican majority in the House that will help deliver on President Trump's historic mandate," Ed Cox, the chair of the New York Republican party, said in a statement Monday.
Trump did not say much about the U.N. during his campaign, but has generally advocated for a less interventionist foreign policy. He has also repeatedly questioned the utility of international alliances, including NATO, and he has threatened allies with higher tariffs and said he will not protect them unless they contribute more to their own defense.
(The Associated Press contributed to this report.)
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