From the article "Nixon told
The date was April 25, 1972. Mr. Nixon and National Security Adviser Henry Kissinger were in the Executive Office Building, mulling over options for ending the war in Vietnam on terms other than those demanded by the North Vietnamese.
Mr. Kissinger was proposing stepped-up attacks on North Vietnamese power plants and docks.
"I'd rather use the nuclear bomb," Mr. Nixon responded.
"That, I think, would just be too much," Mr. Kissinger replied.
"The nuclear bomb. Does that bother you?" Mr. Nixon asked. "I just want you to think big."
From the same article (links are mine):
The tapes also reveal that Mr. Nixon doubted the authenticity of the famous photograph of a nine-year-old Kim Phuc running naked down a road, fleeing a napalm attack in South Vietnam.
Mr. Nixon and chief of staff H.R. Haldeman briefly discussed the now-famous photo on June 12, 1972.
"I'm wondering if that was fixed," he muses after seeing the photograph. Mr. Haldeman replies, "Could have been."

