President-elect Trump’s nomination of Rep. Elise Stefanik (R-N.Y.) as U.S. ambassador to the United Nations sets the stage for one of the organization’s most vocal and combative critics to have a powerful seat at its table. Stefanik, 40, the fourth-ranking House Republican and a devoted Trump loyalist, has little foreign policy experience. But she has built a reputation over the last year as a leading champion of Israel, in part by repeatedly hammering the U.N. for its reproach of the country's military response to last year’s attacks by Hamas. In September, she accused the organization of being infected by “antisemitic rot.”  Her nomination as America’s top envoy to the U.N. sends an early signal that Trump intends to side squarely with Israeli Prime Minister Benjamin Netanyahu, a conservative Trump ally who has ignored President Biden’s calls for a regional cease-fire, as the Middle Eastern conflict expands and intensifies.  The posting also sends a broader message to the world that Trump’s “America First” approach — which envisions a shrinking role for the United States in world diplomacy and global affairs — is likely to reign supreme in his second term.  That strategy is likely to surface most prominently in Ukraine, where Trump has declined to commit more military support as Kyiv continues the years-long battle against Russia’s invading forces. Stefanik called for “devastating action” to defeat Russian President Vladimir Putin early in the war, but voted against a multibillion-dollar aid package to Ukraine earlier this year.  In accepting the nomination Monday, Stefanik defended Trump’s shift toward isolationism, suggesting it would nudge America’s allies into taking a more active role in the pursuit of global peace. “America continues to be the beacon of the world,” she said in a statement, “but we expect and must demand that our friends and allies be strong partners in the peace we seek.”  Trump’s Republican allies on Capitol Hill quickly hailed the nomination on Monday, praising Stefanik as a “fantastic choice” for the position. “She is extremely qualified for this new role in public service, and the House’s loss will be a huge gain for the Trump Administration and the country. There is nobody better to represent President Trump’s foreign policy and America’s values at the United Nations than Elise Stefanik,” House Majority Leader Steve Scalise (R-La.) said in a statement. But her promotion to global envoy is sure to ring alarm bells among both traditional conservatives, who still support a muscular defense of NATO and America’s overseas allies, and Democrats, who consider Stefanik to be an unscrupulous political opportunist and a blind sycophant to Trump.  "Trump's pick of Rep. Stefanik is a gift to Vladamir Putin," said Rep. Gerry Connolly (D-Va.), a senior member of the House Foreign Affairs Committee. "She abandoned Ukrainians in April, and this further signals Donald Trump and MAGA's retreat from the global stage."  Stefanik’s imminent jump to the administration immediately sparked the race to replace her in GOP leadership, with a handful of GOP lawmakers already announcing their bids. It could also complicate Trump’s ambitious 100-day legislative agenda by cutting into what is already expected to be a slim majority for the House Republicans. Although Stefanik serves on the House Armed Services and Intelligence committees, she has made greater waves from her perch as a senior member of the Education and Workforce Committee, where she was in line for the gavel before jumping into House leadership.  But the New York Republican saw her star rise rapidly in December when, during a hearing of the Education committee, she questioned a trio of university presidents about antisemitism on their campuses following Hamas’s Oct. 7, 2023, attack on Israel — an episode that went viral and prompted two of the three leaders to resign from their posts. Since then, the House GOP conference chair has made combating antisemitism a prime part of her portfolio on Capitol Hill, a posture that has included incisive criticism of the United Nations. In October, for example, the New York Republican appeared to threaten U.S. funding for the U.N. over the Biden administration’s alleged “silence” regarding perceived antisemitism in the organization. The statement was in reaction to the Palestinian Authority eyeing an effort to expel Israel from the United Nations. “Should the Palestinian Authority succeed in their antisemitic pursuit, it would result in a complete reassessment of U.S. funding of the United Nations. American taxpayers have no interest in continuing to fund an organization that Joe Biden and Kamala Harris have allowed to rot with antisemitism,” Stefanik wrote. She also took a jab at the United Nations in her May address before the Israeli Knesset, when she became the highest-ranking House member to visit Israel after the Oct. 7 attack. “When the enemy is inside the gates of the United Nations, America must be the one to call it by its name and destroy it,” Stefanik said. “President Trump understood that, and B'ezrat hashem, we will return to that strategy soon.” Stefanik is already making clear that Israel will remain a top priority of hers if she is confirmed as ambassador: The congresswoman is scheduled to meet with Israeli President Isaac Herzog on Tuesday, according to The Times of Israel. The nomination highlights Trump’s penchant for rewarding his most loyal allies with plum assignments. It also marks the culmination of Stefanik’s head-snapping turn from moderate lawmaker with a reputation for reaching across the aisle to fierce partisan who emerged as one of Trump’s most ardent defenders on Capitol Hill. That support first gained prominence during Trump’s first impeachment in 2019, and it only grew louder in the wake of the Jan. 6, 2021, attack on the U.S. Capitol.  That loyalty to the former president was quickly rewarded in the months following the rampage when House Republicans — infuriated that Rep. Liz Cheney (Wyo.), a member of their own leadership ranks, had voted to impeach Trump for his role in the attack — voted to oust Cheney and promote Stefanik as the conference chair.  As House investigators began examining the Jan. 6 attack on the Capitol, Stefanik blamed then-Speaker Nancy Pelosi (D-Calif.) for the rampage. It was a familiar argument — one initiated by Trump.