Washington (CNN) President Donald Trump issued a proclamation on Friday that will bar immigrant visa applicants from entering the United States unless they can prove they will have health insurance or the means to pay for medical care.

Visa applicants will have to prove to consular officials that they will be covered by an approved health insurance within 30 days of entry into the US or possess the financial means to "pay for reasonably foreseeable medical costs." The new requirement could make it more difficult for people -- particularly ones without financial means -- to immigrate to the US. It will take effect on November 3.

"Immigrants who enter this country should not further saddle our healthcare system, and subsequently American taxpayers, with higher costs," Trump said in the proclamation.

Under the White House's proclamation, accepted health insurance includes employer-sponsored and family coverage plans, unsubsidized individual health plans, and short-term plans. Medicaid or Affordable Care Act subsidies do not qualify as "approved health insurance" under the proclamation.

Exceptions to the rule include children of US citizens, unaccompanied minors, permanent residents who are returning to the US after being overseas less than a year, and "special immigrant visas" for Iraqi and Afghan nationals who worked for the US government, and their families.

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