President Donald Trump's plan to pull out of an international treaty designed to bring more transparency to military activities set off an uproar on Thursday, including claims the abrupt move may violate the law.

The Open Skies Treaty, which was first proposed by President Dwight Eisenhower and signed by President George H.W. Bush, permits reciprocal flights over military facilities and has long been considered a stabilizing force, especially for nations that lack spy satellites or other high-tech means to monitor military facilities.

The treaty has been signed by more than 30 nations, including Russia, and went into effect in 2002. Secretary of State Mike Pompeo announced the U.S. on Friday will notify the various parties that it's withdrawing, which will take effect in six months.

“The Administration’s decision to withdraw the United States from the Open Skies Treaty is a slap in the face to our allies in Europe, leaves our deployed forces in the region at risk, and is in blatant violation of the law," said Rep. Adam Smith (D-Wash.), the chairman of the House Armed Services Committee. "This decision weakens our national security interests, isolates the United States since the Treaty will continue without us, and abandons a useful tool to hold Russia accountable."

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