Former Republican presidential nominee Mitt Romney praised President Trump's speech before the United Nations General Assembly on Tuesday, saying it was both strong and necessary.

"President Trump gave a strong and needed challenge to UN members to live up to its charter and to confront global challenges," Romney tweeted Tuesday.

President Trump gave a strong and needed challenge to UN members to live up

to its charter and to confront global challenges. — Mitt Romney (@MittRomney) September 19, 2017

Diplomats and foreign leaders from 193 counties gathered at the United Nations headquarters in New York City for the 72nd annual gathering.

Trump's speech before the United Nations General Assembly was highly-anticipated, and the president's address promoted a message of sovereignty. During the speech, Trump emboldened the members of the United Nations to focus on and defend their own countries and their interests, and called for a "great reawakening of nations."

Romney was a noted anti-Trump Republican leader during the 2016 primary elections, even at one point holding a speech in Utah urging his fellow Republicans not to vote for him.