President Trump is at the U.N. this week for his maiden visit, but the spotlight has shifted from the president onto someone else: Nikki Haley, the U.S. Ambassador to the United Nations.

"Nikki Haley is really emerging, I think, as someone who's a star in that administration and who is nurturing the way forward on policy," said news analyst Charlie Sennott on BPR today.

Sennott explained her strengths — most importantly, a knowledge of governing that is lost on other members of the Trump administration.

"She's effective, she understands governing, she knows the issues, she's taking the job seriously and she's navigating successfully to thread a very, very, very difficult needle to thread, which is to take Trump's foreign policy and bring it to the U.N.," he said. "That's not an easy job to do. Even a B plus on that is extraordinary."

Sennott explained how Haley shines, especially in contrast to Secretary of State Rex Tillerson, who has remained largely silent since the early days of the Trump presidency.

"Tillerson, by all estimations, is an amazing CEO," he said. "But that doesn't translate into government in Washington, and I think he's a CEO who's used to calling the shots, being gruff, being the kind of guy who, when he says something once it needs to get done — that's not really how Washington works."

Sennott noted that Trump's interest in business leaders and generals for his pool of advisers puts Haley in a good position to contrast with his other staff.

"We watched Trump build around himself people from the business world and generals. I think increasingly, he's realizing it's just the generals, because the business world people can't really tolerate the way he acts," Sennott said. "Nikki, I think, ends up in this place where she's a rising star because she's good."

Charlie Sennott is a news analyst here at WGBH where he also heads up the GroundTruth Project. To hear his interview in its entirety, click on the audio player above.