Foreign women are not expected to wear headscarves, but the move contradicted President Donald Trump's old criticism of former First Lady Michelle Obama for making a similar decision.
Religion has been a recurring theme during the visit to the Middle East and Italy by the first lady and Mr. Trump. The Pope had the subject on the agenda, and Cardinal Pietro Parolin, Secretary of State at the Vatican, exhorted Trump to not yank America out of the 2015 Paris climate agreement. "A person who thinks only about building walls, wherever they may be, and not building bridges, is not Christian", the Pope said at the time, which caused Trump to fire back with his own holier-than-thou response.
The commander in chief made worldwide headlines after he was photographed next to the serious-looking pontiff alongside wife Melania and daughter Ivanka, who donned long-sleeved black dresses and veils for the "stiff" visit. The meeting appeared quite respectful but the Pope left Trump with an epic gift: the encyclical he penned on climate change. But Francis underscored his concern by including among his gifts to Trump a copy of a document he has written denouncing human contributions to climate change.
"I didn't know that Melania was going to be saying the Lord's Prayer, but I thought that was attractive, thank you".
It was confirmed by her spokeswoman, Stephanie Grisham, on May 24, hours after Pope Francis blessed a rosary for her at the Vatican, reports the Daily Mail.
It is a clear message for Americans watching from home, most of all: Their leaders will pay homage to backward Catholic traditions.
Meanwhile, Trump called the meeting "great" and "fantastic" and tweeted that it was an honour to meet His Holiness, despite the fact he previously called the Pope's comments about a wall between the U.S. and Mexico being "not Christian" as "disgraceful".
Ivanka and Jared were a constant presence at Trump's side in Israel.
The Trump team is due to fly to Brussels on Wednesday afternoon for meetings with European Union and North Atlantic Treaty Organisation officials before returning to Italy late Thursday for the G7 summit in Sicily on Friday and Saturday.