The Senate has confirmed former White House national security adviser Michael Waltz to serve as U.S. ambassador to the United Nations, just in time for him to attend the body’s general assembly in New York.

The Senate voted 47-43 on Friday to confirm Mr. Waltz to the new post, filling the last open Cabinet-level role in Mr. Trump’s administration.

The gathering of world leaders, which begins Tuesday, comes amid ongoing conflicts overseas. President Trump’s efforts to help broker peace in the wars between Russia and Ukraine and, separately, Israel and Hamas have failed, even though he has aided ends to other world conflicts.

Three Democrats — Sens. John Fetterman of Pennsylvania, Mark Kelly of Arizona and Jeanne Shaheen of New Hampshire — voted in favor of Mr. Waltz’s confirmation, while Republican Sen. Rand Paul of Kentucky voted in opposition.

“THANK YOU President Trump & the U.S. Senate your trust and confidence to Make the UN Great Again #MUNGA,” Mr. Waltz posted on social media after the vote.

The U.N. position has been open for months, initially held up because Mr. Trump first nominated Rep. Elise Stefanik, New York Republican, for the role, only to have her withdraw so she could stay in the House and not risk further eroding the GOP’s narrow majority.

Mr. Waltz had already resigned from the House in January to serve as Mr. Trump’s national security adviser. The president decided in May to remove him from that role and nominate him to serve as U.N. ambassador.

The switch-up came amid negative news coverage over Mr. Waltz mistakenly adding a journalist to a private Signal chat used to discuss sensitive military plans.

• Lindsey McPherson can be reached at lmcpherson@washingtontimes.com.