The provision would effectively consolidate power within the national parties including the Republican and Democratic committees raising money for House and Senate candidates. GOP appropriators tucked the provision into the $20.56 billion fiscal 2016 Financial Services spending bill the full committee is slated to mark up Thursday.

McConnell, R-Ky., a longtime foe of campaign finance restrictions, sought similar language last year as the clock wound down on negotiations over a wrap-up fiscal 2015 spending package (PL 113-235).

“Let me just sum it up: It would strengthen the parties, who have frankly not as much clout anymore, much of the firepower, it is now outside the parties,” McConnell told CQ Roll Call in December. “I don’t think there is anything good about weakening the parties.”