In a 13-page letter, that Rev. Graham had forwarded to the White House in April, 1969, it was stated: “There are tens of thousands of North Vietnamese defectors to bomb and invade the North. Why should all the fighting be in the South?…Especially let them bomb the dikes which could over night destroy the economy of North Vietnam.” Mr. Bothwell underscored that such a military action against the dikes, a huge complex of earthworks, would probably “kill a million people and wipe out an already poor nation’s agricultural system” He added that the advice in Graham’s transmittal “fell on receptive ears. Not longer after, Nixon moved the air war north and west.”
https://www.counterpunch.org/2007/09/27/a-prince-of-war-exposed/