His intended nominee, Heather Nauert, a spokeswoman at the State Department since 2017, said in a statement that “the past two months have been grueling for my family and therefore it is in the best interest of my family that I withdraw my name from consideration.”

Ms. Nauert dropped from the running because she had a nanny who was in the United States legally but did not have the proper work visa, according to people familiar with the process…

Some members of the Senate Foreign Relations Committee had expressed reservations in private about her candidacy, said Brett Bruen, a former diplomat and global engagement official in the Obama administration. The members had questions about whether she had the experience and expertise to deal with counterparts from other countries, especially ambassadors from Russia and China, the two main rivals of the United States on the United Nations Security Council.