By JOSH FUNK, AP Transportation Writer

Senators from both parties pushed Thursday for changes to a massive defense bill after crash investigators and victims’ families warned the legislation would undo key safety reforms stemming from a collision between an airliner and Army helicopter over Washington, D.C., that killed 67 people.

The head of the National Transportation Safety Board investigating the crash, a group of the victims’ family members and senators on the Commerce Committee all said the bill the House advanced Wednesday would make America’s skies less safe. It would allow the military to operate essentially the same way as it did before the January crash, which was the deadliest in more than two decades, they said.

Democratic Sen. Maria Cantwell and Republican Comm

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