Francis, who has clashed with Trump before on migration issues, discussed the situation at the U.S.-Mexican border with veteran Vatican reporter Valentina Alazraki, who is Mexican.
“I don’t know what’s happening with this new culture of defending territories by building walls. We already knew one, that (one) in Berlin, which brought so many headaches and so much suffering,” he said.
Trump, who met the pope at the Vatican in 2017, has said the wall is needed to address a crisis of drugs and crime flowing across the border into the United States and has clashed with the Democrat-controlled House of Representatives and some judges on how to fund it.
Last year, Pope Francis criticized the Trump administration policy of separating children from parents who had illegally crossed the U.S.-Mexico border, a policy Trump later reversed after a widespread outcry.
Last month, Trump denied media reports that his administration was considering reinstating the policy.