The pope appeared serious.
In one of the lighter moments of his meeting with the United States of America president at the Vatican on Wednesday, Francis made an apparent allusion to Trump's imposing physical size. Immediately after the meeting, the 80-year-old pope was due to give his usual midweek address to the faithful on St Peter's square while the Trump couple are given a private tour of the Sistine Chapel and St Peter's Basilica.
In the pope's 2015 encyclical on climate change, he argues that climate change is backed by a very consistent scientific consensus and that the world must confront the causes of climate change while mitigating the effects.
Trump had what he described as a "fantastic meeting" with Pope Francis, with whom he had clashed while running for president over his plan to build a wall on the Mexican border. Based on what we've seen so far, she doesn't seem all that thrilled about embracing the duties of FLOTUS, and she may have a few more years of meet-and-greets like this ahead.
"One image in particular, of a grinning Trump next to a stone-faced Pope Francis, has gone viral". The pope reacted by saying he "never, ever wanted to make a judgment without hearing the person".
The Pope's gift left no questions about its symbolism, presenting President Trump with an olive tree medal crafted by a Roman artist that the Pope said symbolizes peace.
The night before the meeting, a top Vatican official took to social media.
Despite some initial confusion on whether the Pope was talking about pizza, the penny eventually dropped for Mrs Trump.
Even in 2013, former US President Barack Obama's wife Michelle Obama hadn't worn a head scarf in Saudi Arabia. Who can blame them, right?
He then travelled on to meet the Israeli and Palestinian leaders and was in Rome on Wednesday to meet the Italian government and Pope Francis for the first time.
Trump's visit to the Vatican has been met with a number of smaller protests. They also expressed fears of terrorism in Europe.
Also getting an introduction was longtime security aide Keith Schiller, who followed Trump to the White House, and Hope Hicks, who served as Trump's spokeswoman during his campaign and joined his White House staff.