The Viscount travelled abroad on official trips—in 1947 visiting US president Harry S. Truman and in June 1948 Brazilian president Eurico Gaspar Dutra—as well as hosting a number of dignitaries. The visit of the Irish Taoiseach, John A. Costello, in 1948 caused Alexander some embarrassment when Costello chose the occasion to announce that most of Ireland would leave the Commonwealth (Northern Ireland would remain a constituent part of the United Kingdom). Although the decision had been taken in principle earlier, the sudden announcement caused a diplomatic storm and Costello, to deflect criticism, claimed that he had been provoked into making the announcement by a series of diplomatic snubs by Lord Alexander. In his memoirs, Costello was to admit that Alexander's behaviour had in fact been perfectly civil and could have had no bearing on a decision which had already been made to declare the Republic of Ireland.