

“These travelers were denied entry after attempting to enter the U.S. under false pretenses. One used a Visitor visa, the other the Visa Waiver Program,” CBP Assistant Commissioner Hilton Beckham said in a statement. “Both claimed they were touring California but later admitted they intended to work – something strictly prohibited under U.S. immigration laws for these visas.”
Provided that that’s true, and I’m not saying it definitely is, that would be a valid reason to deny entry.
In case you missed that part.