Question details
Assuming that the Mexican citizen holds a passport that is valid for at least three years and that the alien is otherwise admissible, isn't it true that an employer’s letter or statement confirming that the employer intends to employ the alien for a temporary period of up to three years is sufficient to support admission for the requested period of time.
ANSWER
U.S. Customs and Border Patrol (CBP) indicates that this is true. A Mexican citizen TN nonimmigrant applicant for admission whose passport is valid for the requested admission period, and who is in possession of an employment letter confirming the employment period of up to 3 years, should be admitted for a 3-year admission period.