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.
Expect a push for more defense spending, more focus on China, and more debate over military social policies.
Proposal aims at ramp up the U.S. defense industrial base and helping European allies arm up.
Lawmakers will start floor work on the bill next week but aren't expected to make significant progress until after the election.
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