A battle is brewing in congress over the TSA allowing small pocket knives on planes.

The TSA says it plans to allow those small knives on airplanes and now some airlines, flight crew members and air marshals are outraged.

TSA officials say airport security needs to focus on larger concerns like bombs.

Now, a Massachusetts congress member is introducing a bill to stop the plan.

"It makes absolutely no sense to allow passengers to carry knives like this into the passenger cabins of planes anywhere in our country," said Representative Ed Markey.

The TSA says the decision was intended to match US regulations with European rules in an effort to make flying more convenient for passengers.

That rule change goes into effect next month.