President Donald Trump's plan to require foreign tourists to disclose up to five years of their social media history before entering the United States will have implications for travelers from dozens of countries.

The change would apply to those seeking entry into the country via the Electronic System for Travel Authorization (ESTA), instead of a visa.

Those that can apply through the ESTA must be nationals or citizens of Visa Waiver Program (VWP) countries, meaning all of these countries would be affected should the rule be implemented.

Why It Matters

Since Trump's second term in office, his administration has been bringing in new policies to not only clamp down on immigration and border control, but also on entry for foreign travelers.

Earlier this year, a number of countries issue

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