(CNN) - The Rev. Franklin Graham, son of famed evangelist Billy Graham, on Tuesday questioned whether Mitt Romney's Mormon faith qualified as Christianity.
He also raised concerns about President Barack Obama's dedication to Christianity, as well as to Christians living in Muslim countries.
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The Church of Jesus Christ of Latter-day Saints, or Mormons as members are colloquially known, identify themselves as Christians.
Asked if he considered Romney a Christian in an appearance on MSNBC's "Morning Joe," Graham said most Christians would "not recognize Mormonism" as part of Christianity.
"Of course, (Mormons) believe in Jesus Christ. But they believe in a lot of other things, too, that we don't accept," Graham said. "He would be a good president if he got the nomination."
Romney's faith has faced scrutiny during both of his Republican presidential bids, with high-profile religious leaders raising concerns about the role his faith plays in his electability.
As for Obama, Graham repeated his uncertainty over whether the president is sincere enough in his faith. He said when he asked Obama about how he became a Christian, the president said he joined a church in Chicago after becoming a community organizer, leaving Graham to speculate whether he became a Christian for the right motives.
"You have to ask him. I cannot ask that question for anybody," he said.
The evangelical made headlines in 2010 when he said he believed Obama was born a Muslim because of his heritage, but now believes he is a Christian.
On Tuesday, he reaffirmed that he does not consider Obama a Muslim, but repeated his argument about Obama's lineage and ties to Islam.
"Under Islamic law–Sharia law–Islam sees him as a son of Islam. Because his father was a Muslim, his grandfather was a Muslim...That's just the way it works," he said. "That's the way they see it. He says he didn't grow up that way and he believes in Jesus Christ, so I accept that."
Graham was mostly upset with the president's policies toward some Muslim nations, arguing that "Islam has had a pass under Obama."
Following the events of the Arab Spring, Graham said Islamists are taking control of the Middle East and "Christian minorities throughout the entire Arab World are under attack."
Graham called on the president to threaten an end to foreign aid to certain countries until they work harder to protect their minorities.
"All I know is under Obama, President Obama, the Muslims of the world. He seems more concerned about them than the Christians that are being murdered in the Muslim countries," Graham said. "That's what really bothers me."
- CNN Chief White House Correspondent Jessica Yellin contributed to this report.