check Permissible Use in your insurance

https://www.nolo.com/legal-encyclopedia/permissive-use-car-insurance-coverage.html

I suggest you ask your insurance company. 

From the article

If you lend your car to a driver with substantially less driving experience than you or the other members of your household, it is possible that your insurance company will also try to deny coverage. You might think that is unjust, but insurance companies base this argument on the fact that they determine your insurance premium based on the driving records of the persons named on the policy. If they knew that a person with much less driving experience than you would be driving your car, they might have increased your premium.

 

I can see a problem when you lend your car to a foreign driver, who might not be as familiar as US driving conditions.  Your insurance company might invoke this exeption to deny coverage.