Donald Trump may have brushed off his feud with Pope Francis, but other candidates haven't been as resilient in forgetting the Pope's commentary on the GOP frontrunner.

This week, Democratic candidate Bernie Sanders told Salt and Light Catholic Media Foundation that the current Pope is, in fact, a socialist, which may explain his disdain for Trump.

"What it means to be a socialist is that we have to live our lives in a way that alleviates human suffering and when he talks about wealth being used to serve people, not as an end in itself, he does not believe in trickledown economic theory," Sanders said.

Watch: What do Bernie Sanders and Pope Francis have in common?

Pope Francis was last profiled in the election cycle due to his remarks about Donald Trump, made while visiting Mexico last week.

"A person who thinks only about building walls, wherever they may be, and not building bridges, is not Christian," the Pope said.

The comment wasn't an attack on Trump's faith as much as his actions. In other words, what would Jesus do? Would Jesus threaten to send millions of migrants back to their homes? I don't think so.

American politicians love dragging religious leaders into politics as much as pundits love attacking politicians on their beliefs. On this Tuesday's Democratic Town Hall, CNN took a slightly less softball approach than it did with the GOP candidates last week. Sanders, a non-practicing Jew, was questioned on his own religion, which he said was about empathizing.

"Do onto others," Sanders told CNN's Chris Cuomo. "We are in this together."