Exchange visitors who are citizens of Visa Waiver Program (VWP) participating countries are not permitted to travel without a visa on the VWP, if their purpose of travel is to participate in an exchange visitor program, as explained below. Exchange visito

Generally, a citizen of a foreign country who wishes to enter the United States must first obtain a visa, either a nonimmigrant visa for temporary stay, or an immigrant visa for permanent residence.

U.S. law requires companies to employ only individuals who may legally work in the United States – either U.S. citizens, or foreign citizens who have the necessary authorization.

In certain visa categories such as diplomats, students and exchange visitors, the alien may be admitted into the U.S. for as long as the person is still doing the activity for which the visa was issued, rather than being admitted until a specific departur