[DoughtyOne]

Here's a long article touching on the issue.LINK

Be aware:

iCBS!

[DoughtyOne]

Of possible interest, since you were pinged on the issue.

See post this responds to.

[ding_dong_daddy_from_dumas]

The U.S. attorney's office for the Southern District of New York granted Veselnitskaya immigration parole in October 2015, setting an expiration date of January 7, 2016, DOJ attorneys later told the court. On January 4, Veselnitskaya's request to extend her parole was denied, according to a declaration filed in U.S. District Court on January 5.2016.

....The Justice Department did not immediately respond to questions about whether Veselnitskaya was granted immigration parole after January 14 and, if not, how she was permitted entrance to the U.S. for the meeting in Trump Tower.

I doubt that US customs would allow her to enter the US without a valid visa or permission from above. The article you linked asks "why?" My question is "who?"