By Joshua McElwee VATICAN CITY (Reuters) -In his first month, Pope Leo has taken a very different approach to his predecessor Francis. Leo, the former Cardinal Robert Prevost, has led some two dozen public events since he was elected as the first U.

According to the Rev. John Wauck, professor of church communication at the Pontifical Holy Cross University in Rome, Leo’s clothing choices are a “return to form,” and his attire similar to that worn by Pope Benedict XVI, Pope John Paul II and other popes going back to the middle ages.

The meeting with the U.N. chief took place in the pope's study in the Paul VI Audience Hall before the pope's morning general audience in St. Peter's Square, the Vatican press office said in a communique.

Pope Leo criticized the emergence of nationalist political movements on Sunday, calling them unfortunate, without naming a specific country or national leader. Leo, the first pope from the U.S., asked during a Mass with a crowd of tens of thousands in St.

About two-thirds of American Catholics have a “very” or “somewhat” favorable view of Pope Leo, according to the new survey from The Associated Press-NORC Center for Public Affairs Research, while about 3 in 10 don’t know enough to have an opinion. Very few Catholics — less than 1 in 10 — view him unfavorably.

Carlo Acutis, an Italian teenager, was meant to be made a saint in April, but the ceremony was postponed because of Pope Francis’ death.

The 69-year-old former Cardinal Robert Prevost, the first U.S. pope in history, has led around two dozen public events since his election on May 8, but has yet to make significant appointments, announce foreign trips,