Few details are known about a possible law to make tourists entering the US provide five years of social media history.
It would affect those currently able to visit visa-free, including New Zealanders, Australians and Brits.
Officials could request social media information, email addresses, phone numbers, and information about family members.
US immigration lawyer Brian Hunt says based on previous policy, we can infer what the US hopes to achieve.
"I think they're looking for pretty extreme language when it comes to anti-Semitism - and then they also said they're vetting for anti-American activity."
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