In 1972, Nixon visited China as the president of America. But few peoples know that he visited China in 1976. So my answer is “ TWICE”. Source:http://d.wanfangdata.com.cn/Periodical/wsjh200907001. read more
Nixon visited China seven times overall, six of which were as a private citizen: February, 1972. The first official visit by a US president to PRC, as described in 1972 Nixon visit to China. February, 1976. A personal visit at Mao's invitation, for which he was widely criticized at home. read more