On August 10, 1960, for example, Graham sent a letter to John F. Kennedy, the Democratic nominee for president and only the second Roman Catholic to run on a major-party ticket. Graham assured Kennedy in no uncertain terms that, contrary to rumors, the evangelist had no intention of raising the “religious issue” during the course of the campaign.
Eight days later, however, Graham convened a gathering of American Protestant ministers in Montreaux, Switzerland, to discuss how to derail Kennedy’s campaign. The follow-up to the Montreaux meeting was a closed-door gathering of 150 Protestant clergy at the Mayflower Hotel in Washington on November 7—the purpose of which, once again, was to sound the alarm about the dangers of a Roman Catholic in the White House.
That's Randall Balmer speaking, an Episcopal priest and author of God in the White House: A History: How Faith Shaped the Presidency from John F. Kennedy to George W. Bush