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In page Billy Graham:

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In 1970, Nixon appeared at a Graham revival in East Tennessee, which they thought safe politically. It drew one of the largest crowds in Tennessee and protesters against the Vietnam War. Nixon was the first president to give a speech from an evangelist's platform.[2] Their friendship became strained in 1973 when Graham rebuked Nixon for his post-Watergate behavior and the profanity heard on the Watergate tapes.[11] They eventually reconciled after Nixon's resignation.[2]