Latest "tim kaine" stories
McCarthy's threat comes as Republicans and Democrats are negotiating a final, bicameral version of the bill with the aim of passing it in December.
The panel would have two years to make recommendations on U.S. strategy, similar to the Cyberspace Solarium Commission.
They want to reverse a White House decision to let Pentagon leaders strip collective bargaining rights from military civilians.
By Joe Gould and Jessie Bur