WASHINGTON — The White House is finalizing an executive order that would expand health plans offered by associations to allow individuals to pool together and buy insurance outside their states. The move follows failed efforts by Congress to overhaul the health care system.

President Donald Trump has long asserted that selling insurance across state lines would trigger competition that brings down premiums for people buying their own policies. Experts say that’s not guaranteed, partly because health insurance reflects local medical costs, which vary widely around the country.

Trump is expected to sign the executive order next week.

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