Nachum Segal is proof that, sometimes, if you want something, all you have to do is ask.

For three years now, since Mayor Bloomberg took the reins at City Hall, Mr. Segal, host of one of the most popular radio shows in the Jewish radio market, “JM in the AM,” has been asking for a mayoral invitation to visit Israel.

“This has been a running joke. I ask him to take me to Israel every time he comes on the show,” Mr. Segal told The New York Sun in an interview yesterday. Mr. Bloomberg’s known generosity with seats on his private jet made the request less farfetched, Mr. Segal joked.

Last week, when Mr. Bloomberg came to the “JM in the AM” studios, Mr. Segal made another pitch: “Next time you go to Israel, will you take me with you?”

Mr. Bloomberg hesitated, laughed, and then said he would. A day later, Mr. Segal’s phone rang and the mayor’s staff invited him to be part of a high-level delegation leaving today for the dedication of Yad Vashem’s new Holocaust History Museum in Jerusalem.

The inaugural events will take place over two days, beginning tomorrow, and will bring together dozens of world leaders at what an organizer described as the “biggest summit of world leaders gathered in Israel” in some time. Mr. Bloomberg is leader of the American delegation.

In addition to the mayor and Mr. Segal, that delegation will include the owner of the Cleveland Browns football team, Norma Lerner; the rabbi emeritus at Sinai Temple at Champaign-Urbana, Ill., Rabbi Isaac Neuman; the Nobel laureate Elie Wiesel; the chairman of the U.S. Holocaust Memorial Council, Fred Zeidman; a former mayor, Ed Koch; City Council Member Simcha Felder of Brooklyn; the CEO of the Jewish Community Relations Council of New York, Michael Miller, and Mr. Bloomberg’s community assistance unit commissioner, Jonathan Greenspun.

“He may have known about this trip already when he walked into the studios last week,” Mr. Segal said yesterday, “but he didn’t let on. Everyone is teasing me, saying I should have asked him for Jets Super Bowl tickets.”

A graduate of Mesivta Ohr Torah of Riverdale and Yeshiva University’s Yeshiva College, Mr. Segal began his radio career in college and then started a morning broadcast on WFMU (91.1 on the FM dial) 22 years ago, tapping into a Jewish audience that was looking for music and commentary tailored to them.

The show, “JM in the AM,” which stands for Jewish Moments in the Morning, is unabashedly Orthodox and rightward-leaning. It has 54,000 listeners, according to Mr. Segal.

The show has evolved from a platform for Jewish music to one of the most influential Jewish press or broadcast outlets in the tri-state area. In 1992, Mr. Segal added an evening broadcast, on 620-AM at 7 p.m.

Mr. Segal, 42, is right of center on Israeli politics and says he represents the typical young Orthodox person in terms of his politics and his taste in music – and his show reflects those preferences.

While the radio host stopped short of giving Mr. Bloomberg his endorsement ahead of the November election, he did say he (and the Jewish community he represents) has a soft spot for the mayor.

“There is a type of appreciation the Jewish community has toward incumbents,” he said carefully. “And in Bloomberg’s case, on the whole, there is an attitude that he has represented us well, and supports Israel, so there is a soft spot for him in that regard.”

Mr. Bloomberg and his delegation are to return from Jerusalem Wednesday night. This is Mr. Bloomberg’s fourth trip to Israel.