“It is a mark of an evil spirit to assume the appearence of an angel of light. He begins by suggesting thoughts that are suited to a devout soul, and ends by suggesting his own. For example, he will suggest holy and pious thoughts that are wholly in conformity with the sanctity of the soul. Afterwards, he will endeavor little by little to end by drawing the soul into his hidden snares and evil designs.”
–St. Ignatius Loyola, “Rules for the Discernment of Spirits”
The Pope is a good Jesuit and knows this well.
This article, The President Meets the Pope is a post from The Bellarmine Forum.
https://bellarmineforum.org/the-president-meets-the-pope/
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