Senate conservatives plot their second act after taking on McConnell

The Senate GOP’s upstarts aren’t done yet.

About a half-dozen Republican senators, most of whom publicly opposed Mitch McConnell as their leader last month, are getting more organized in a bid to exert their leverage in the chamber. They’re pushing their colleagues for a formal legislative agenda and to extract more concessions from Democrats, according to multiple senators and aides.

These GOP senators have been quietly meeting on a regular basis to strategize future battles worth picking within McConnell’s ranks, and they’re set to call a special conference meeting next...