Can entry into US just before visa expires create any problems? [duplicate]

My mother's visa is expiring soon. I am intending to take her to USA on a one month trip but I am fearful, her entry into USA when her visa is expiring that soon may cause problems?

Note that I have done that before, she last entered USA when her visa was expiring in about 20 days. She then got another 5 year multiple visa, but now that visa is expiring soon too.

My concern is, would it be ok for my mother to enter USA just 3 days before her visa expires. She will have a return ticket.

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Can I enter the US just before my visa expires?

A visa must be valid at the time a traveler seeks admission to the United States, but the expiration date of the visa (validity period/length of time the visa can be used) has no relation to the length of time a temporary visitor may be authorized by the Department of Homeland Security to remain in the United States.

Are we allowed to enter US with less than 6 months expiry date?

As a general rule, passports must be valid for six months beyond the date the traveler will exit the United States. However, the United States has signed agreements with a number of countries to waive this requirement.

How soon can I re enter the USA on tourist visa?

There is no limit on the number of times you may enter the U.S. under either ESTA of a visa. However, if reentering the U.S. using ESTA soon after staying for nearly 90 days, you can expect to be questioned in detail by the immigration officer about the purpose of your visit.

Can I travel back to the US with an expired visa?

Many nonimmigrants will need to reapply and be reissued visas to reenter the U.S. when their existing visas have expired, even if they are in possession of valid admission stamp or paper Form I-94, because automatic revalidation applies to limited categories of travelers.

BEING LEGAL IN THE U.S EVEN AFTER YOUR VISA EXPIRES

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Felicity Tai, Felicity Tai, Charles Parker, Felicity Tai