肯尼迪半美元
In 1969, Nixon administration Mint Director Mary Brooks sought the reissuance of the dollar coin. By this time, rising bullion prices threatened the continued use of silver in the Kennedy half dollar, but Brooks hoped to maintain the dollar as a silver coin. Brooks' proposal for a new silver dollar was opposed by the chairman of the House Banking Committee, Wright Patman, who had been persuaded, against his better judgment, by Nixon's predecessor, Lyndon Johnson, to support the continued use of silver in the half dollar.