VATICAN CITY - U.S. Secretary of State Marco Rubio left the Vatican on Thursday after seeing Pope Leo in what was expected to have been a fraught meeting following President Donald Trump'srepeated attacks on the Catholic leader over the Iran war.

Rubio spent 2-1/2 hours at the Vatican before driving away in a convoy under tight security. He met initially with Leo before sitting down with senior Vatican officials, including top diplomat Italian Cardinal Pietro Parolin.

The Vatican and the U.S. State Department did not provide any immediate details about the encounters.

Rubio's meeting with Leo, the first between the pope and a Trump cabinet official in nearly a year, appeared to have run longer than planned. The pope arrived 40 minutes late for a subsequent appointment with Vatican staffers, and thanked them for being patient.

Vatican photos of the meeting showed Leo and Rubio shaking hands before sitting down together at the pope's official desk in the Vatican's Apostolic Palace.

Leo, the first U.S. pope, drew Trump's ire after becoming a firm critic of the U.S.-Israeli war on Iran and the Trump administration's hardline anti-immigration policies.

The president has kept up an unprecedented series of public attacks on the pope in recent weeks, drawing a backlash from Christian leaders across the political spectrum.

On Monday, Trump falsely suggested the pope believed it was okay for Iran to obtain nuclear weapons and said Leo was "endangering a lot of Catholics" by opposing the war.

Leo told journalists after the latest attack that he was spreading the Christian message of peace. The pope also firmly rejected the idea that he supported nuclear weapons, which the Catholic Church teaches are ​immoral.

"The mission of the Church is to preach the Gospel, to preach peace," said the pope. "The Church has spoken out for years against ​all nuclear arms, on that there is ⁠no doubt."

As Rubio arrived at the Vatican earlier on Thursday, Polish Prime Minister Donald Tusk was leaving from a meeting with Leo. He told journalists he and the pope discussed how to strengthen international cooperation and generate hope in the world.

"It is still possible that the world does not have to descend into chaos, if good people, people of goodwill, find one another and act in unity," Tusk said, speaking in Polish.

US AMBASSADOR EXPECTS 'FRANK' CONVERSATION

Leo, who on Friday marks his first year leading the 1.4-billion-member Church, has grown more outspoken on the world stage in recent weeks.

During a four-nation African tour last month he forcefully decried the direction of global leadership and said the world was "being ravaged by a handful of tyrants", in comments he later said were not aimed directly at Trump.

Rubio is Catholic, as is Vice President JD Vance. The two met Leo a year ago after attending the pope's inaugural mass.

Rubio said at a White House briefing on Tuesday that he expected to discuss Cuba and concerns over religious freedom around the world with Leo.

He arrived in Rome on Thursday morning without any press accompanying him on his plane, which is unusual for a U.S. secretary of state.

The U.S. ambassador to the Holy See, Brian Burch, told journalists earlier on Tuesday that the conversation between the pope and cabinet official was likely to be "frank".

Rubio is visiting Rome for two days. He is due to meet Italian Prime Minister Giorgia Meloni, who has defended the pope from Trump, on Friday. Meloni's defence minister has also said the war in Iran puts U.S. leadership at risk.

-Joshua McElwee; Editing by Alex Richardson and Crispian Balmer/Reuters