Panama City, Panama (CNN) Pope Francis has taken another shot at wall-building politicians, telling thousands of Catholics in Panama gathered for World Youth Day that "builders of walls sow fear" and "divide people."

"We know that the father of lies, the devil, prefers a community divided and bickering," Francis told a crowd of tens of thousands of youth Thursday night at a seaside park in Panama City.

"This is the criteria to divide people: The builders of bridges and the builders of walls, those builders of walls sow fear and look to divide people. What do you want to be?"

When the crowd replied "builders of bridges," Francis replied, "You learned well. I like that."

The Pope's remarks seemed to be a clear reference to President Donald Trump's proposal to build a wall along the US-Mexico border. Trump's demand for $5.7 billion for the wall has led to a partial government shutdown for 34 days and counting.

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