Mrs. Haley disagreed with President Trump, arguing that the United States should continue to support Ukraine in its fight against Russia.
She later said she would vote for him in November, saying the former president “would be wise to reach out to the millions of people who voted for me.”
On Tuesday night, she told supporters who were taking a neutral stance, “You don't have to agree with Trump 100 percent. Just vote for him.”
“Tonight is our night of unity,” said Senator William Gannon of New Hampshire, who served as Haley’s delegate and believed Trump made the right choice in inviting her to speak.
“I want to win the national election,” he said. “It was a smart move to bring her in.”
Florida Gov. Ron DeSantis, who came in third in the primary, received a much warmer welcome from the crowd.
He has addressed several conservative social issues, including diversity initiatives, which he has called “brainwashing.”
He urged the crowd to support Trump. But they were already firmly behind the incumbent candidate. “We can’t let him down, and we can’t let America down,” DeSantis said.
He also criticized Mr. Biden’s age, an issue that is currently rocking the Democratic Party. “We need a commander in chief who can lead 24 hours a day, seven days a week,” he said.
Daniel Willis, the 25-year-old chairman of the Delaware Young Republicans, said Mr. DeSantis and Ms. Haley had done enough to “bridge the gap” with Trump supporters.
The rest of the night was devoted to the usual Republican campaign rhetoric: migrant crossings at the border, crime and a sweeping pledge to defeat Mr. Biden.
Texas Senator Ted Cruz said there had been a “literal invasion” of the United States. Dr. Ben Carson, who served in Trump’s cabinet, accused Democrats of “destroying the Constitution.”
President Trump gave a thunderous standing ovation to Madeleine Brame, a woman whose son was killed in New York in 2018, and who has been calling for tougher policies on crime ever since.
Delegates said they were ready to overcome the party's divisions in the primaries and instead focus the party's energies on President Biden.
“At the end of the day, we’re all Republicans,” said Georgia Rep. Pam Wright.
