Like millions of other Americans, Franklin Graham watched the disturbing images of last week's riots at the U.S. Capitol with swelling concern and anger. 

Graham, son of the late evangelist Billy Graham and head of the Billy Graham Evangelistic Association, said he was sickened to see "people attack my Capitol and break down the doors of my Capitol" and was dismayed to see how President Donald Trump riled up the protesters. 

"I don't think it was the president's finest moment," he said. 

But Graham said he doesn't expect the tumult at the Capitol to deter evangelical Christians from continuing to support Trump.

"I don’t think he had any understanding in that moment of what was going to take place," he said. "None of us did."

Graham added: "He regrets it."