The TN category was created specifically to allow Canadian and Mexican citizens to accept employment in the U.S. in certain professionals as defined by the North American Free Trade Agreement (NAFTA). TN status is employer-specific and TN status holders can be admitted to the US in increments of up to three years. Extensions of stay are also granted in up to three-year increments. There is no cumulative total limit on the time a foreign national can be in TN status, provided that the stay remains temporary in nature. There is no limit on the number of workers granted TN status each year.