"Each man questioned the other's sanity. Nixon told a top aide to keep a file on Mr Kissinger's mental health. For his part, Mr Kissinger, obsequious in the presence of Nixon, in conversations with journalists would refer to Nixon as a “madman”, “maniac” or “meatball mind”. The insults went further. Nixon called Mr Kissinger his “Jew boy” behind his back and, occasionally, to his face. Mr Kissinger would remain silent or even support Nixon's anti-Semitic outbursts....Among Mr Kissinger's unguarded comments are his reference to the North Vietnamese as Russia's “little yellow friends” and his advice to Hafez Assad, the brutal president of Syria, that their mutual goal should be to avoid a situation that helped “the Jewish newspapers in the United States”."