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What happens to individuals who entered on a valid ESTA before January 21 and are still in the United States?

What happens to individuals who entered on a valid ESTA before January 21 and are still in the United States?

An ESTA only needs to be valid upon admission to the United States.  An ESTA is an authorization to travel to the United States and admission to the United States is determined upon arrival at the port of entry.  The admission is not affected.  However, if a traveler who was admitted under the VWP leaves the United States to another country, like Canada, Mexico or a Caribbean country, and tries to return, he/she may not be eligible to re-enter the United States.