New York Rep. Elise Stefanik, President-elect Donald Trump’s pick for US ambassador to the United Nations, is now refusing to stand by her previous push for Ukraine’s NATO membership — a stance she once framed as critical to regional stability.

Several global crises will confront Elise Stefanik as U.S. ambassador to the U.N. Among them will be conflicts between the United Nations and the administration she represents.

President-elect Donald Trump has tapped House Republican Conference chair and longtime ally Rep. Elise Stefanik, of New York, to serve as ambassador to the United Nations. Stefanik is Trump's first Cabinet pick for his second term in the White House.