At present, the likelihood of international agreements being concluded through executive agreements is ten times more likely. Despite the relative ease of executive agreements, the president still often chooses to follow the formal contractual process of an executive agreement in order to gain congressional support on issues that require Congress to pass implementing legislation or appropriate means, as well as agreements that impose complex long-term legal obligations on the United States. For example, the agreement between the United States, Iran and other countries is not a treaty. Theme: Ageing, human rights and civil liberties, international treaties and agreements/human rights Australian treaties generally fall into the following categories: extradition, postal agreements and payment vouchers, trade and international conventions. Tribe or power with which the United States may enter into contracts. Some treaties give the President the power to fill in the gaps through executive agreements and not through additional contracts or protocols. . . .