A local US bishop has slammed President Joe Biden as "stupid" for his divergent stance on Catholic teachings.

Bishop Robert Gruss of Saginaw Diocese, Michigan, discussed forgiveness for public figures in a lecture earlier this month, Fox News reports.

During the lecture, Gruss referred to Biden as "stupid" in relation to his understanding of Catholic values, which sparked laughter despite being intended to express pity rather than insult.

Biden has embraced a public affiliation with Catholicism while also supporting abortion, gender ideology, and other policies contrary to Church teaching.

"I don't have any anger towards the president. I feel sorry for him. I'm not angry at him, he's just stupid," Gruss said.