Pope Francis is questioning whether someone with President Trump’s views on immigration should really be considered “pro-life,” reigniting a feud between the major world leaders that famously boiled over during the presidential race.

“I have heard the president of the United States speak,” Francis said aboard the papal plane on Monday, reported the National Catholic Reporter. “He presents himself as a pro-life man. If he is a good pro-lifer, he should understand that the family is the cradle of life and you must defend its unity.”

The pontiff was responding to a question from a Mexican reporter about Mr. Trump’s decision to end the Deferred Action for Childhood Arrivals program, known as DACA, which granted a two-year stay of deportation to illegal immigrants who were brought to the country as children.

Francis levied a similar charge against Mr. Trump during the presidential race, when he said someone “who thinks only about building walls” and not “building bridges is not a Christian.” Mr. Trump, who called those comments “disgraceful” at the time, has yet to respond to the pope’s latest barb.

By questioning Mr. Trump’s pro-life bona fides, Francis echoed a popular progressive talking point — that abortion opponents are not living up to the “pro-life” mantra when they reject progressive views on issues ranging from welfare to immigration and the environment.