The Ba'athist government collapsed in November 1963 over the question of unification with Syria (where a rival branch of the Ba'ath Party had seized power in March) and the extremist and uncontrollable behavior of al-Sa'di's National Guard. President Arif, with the overwhelming support of the Iraqi military, purged Ba'athists from the government and ordered the National Guard to stand down; although al-Bakr had conspired with Arif to remove al-Sa'di, on January 5, 1964, Arif removed al-Bakr from his new position as Vice President, fearful of allowing the Ba'ath Party to retain a foothold inside his government. On November 21, 1963, the Kennedy administration determined that because Arif remained the Iraqi head of state, diplomatic relations with Iraq would continue unimpeded.