President Donald Trump unleashed another bold attack on Joe Biden over religion. Biden, who is a devout Catholic, condemned the comments as “shameful.”

“No religion, no anything,” Trump told supporters at a brief airport rally in Cleveland. “Hurt the Bible, hurt God. He’s against God, he’s against guns, he’s against energy, our kind of energy.”

Biden, who has been open about how his Catholic faith helped him survive the death of his first wife and their daughter in a 1972 car crash, characterized Trump as a hypocrite making cynical appeals to religious conservatives.

“For President Trump to attack my faith is shameful,” the Democratic presidential candidate said. “It’s beneath the office he holds, and it’s beneath the dignity the American people so rightly expect and deserve from their leaders.”

Biden also expressed Trump’s comments reveal more about him than they do about anyone else, he said.

“They show us a man willing to stoop to any low for political gain, and someone whose actions are completely at odds with the values and teachings that he professes to believe in,” Biden said.

Biden has been vocal about the role his faith plays in his life.

In an emotional interview with Late Show host Stephen Colbert, Biden opened up about his faith and religion and how it helped him through his son’s death.

This interview was one of the first he had done since losing his son, Beau, to brain cancer before he had mentioned his bid to enter the presidential race.

People didn’t expect Biden to open up as much as he did, talking about his Catholic faith, and how it provided him with an “enormous sense of solace.”

Years before his oldest son’s death, Biden’s first wife and daughter were killed in a car accident. Biden shared with Colbert that his faith helped him cope during his darkest period:

“I go to mass, and I’m able to be just alone, even in a crowd,” he said. “It’s just a place you can go.”

He also shared how his wife, Jill, plays a role in lifting his faith. She leaves inspirational notes for him, including a quote from philosopher Kierkegaard that says, “Faith sees best in the dark.”

Biden shared that his religion not only helped him through the loss but also gives him tremendous comfort.

“Some of it relates to rituals, some of it relates to the comfort of what you’ve done your whole life,” Biden said. “What my faith has done is… it sort of takes everything about my life — with my parents and my siblings and all the comforting things. And all the good things that have happened around the culture of my religion and the theology of my religion.”