WASHINGTON, D.C. - After reviewing a challenge to an arbitrator appointed by the government of Canada in a dispute pending in the Permanent Court of Arbitration, the deputy secretary-general of the International Centre for Settlement of Investment Disputes on Oct. 14 ruled that an arbitrator must choose between acting as an arbitrator in the PCA dispute or continuing to advise the government of Mexico (Vito G. Gallo v. Government of Canada, ICSID). From Mealey's International Arbitration Report