The Royal Prerogative also extends to foreign affairs: the sovereign or Governor-General negotiates and ratifies treaties, alliances, and international agreements. As with other uses of the Royal Prerogative, no parliamentary approval is required; however, a treaty cannot alter the domestic laws of Jamaica; an Act of Parliament is necessary in such cases. The Governor-General, on behalf of the Queen, also accredits Jamaican High Commissioners and ambassadors, and receives diplomats from foreign states. In addition, the issuance of passports falls under the Royal Prerogative, and, as such, all Jamaican passports are issued in the monarch's name.