Leo, who last year became the first US-born pope, has previously also questioned the Trump administration’s approach to immigration.
“Leo should get his act together as Pope,” Trump wrote in a TruthSocial post at the time.
Speaking in Cameroon, the Pope criticised leaders who “turn a blind eye to the fact that billions of dollars are spent on killing and devastation, yet the resources needed for healing, education and restoration are nowhere to ​be found.”
“The masters of war pretend not to know that it takes only a moment to destroy, yet often a lifetime is not enough to rebuild,” he said.