In his first "Urbi et Orbi" (to the city and the world) message, Francis also called for peace between Israelis and Palestinians, an end to the civil war in Syria, and political solutions to conflicts in several African countries.
The former Cardinal Jorge Bergoglio of Argentina also condemned the "iniquitous exploitation of natural resources" and urged everyone to be "guardians" of creation.
More top news
Defence Secretary James Mattis has distanced himself from Mr Trump's assessment of the media, as has Republican senator John McCain.
A two-year-old boy was found dead in a Perthshire river after being reported missing on Sunday morning.
Eagle-eyed Twitter users spotted that a campaign photo the party claimed was in Stoke on Trent, was actually in Bolton.