A handful of Republican senators have broken with President Trump on four issues this week, even as they're in lockstep with him on the government shutdown.

Why it matters: From tariffs to troop levels, some Republicans are starting to flex their institutional muscles. • It's not outright defiance, but the renegade senators are delineating when and where they're willing to defy Trump.

1) Tariffs: Senate Republicans joined with Democrats three times this week to pass joint resolutions repealing Trump tariffs — on Brazil, Canada and worldwide. • Sens. Lisa Murkowski (R-Alaska), Susan Collins (R-Maine), Rand Paul (R-Ky.), Mitch McConnell (R-Ky.) and Thom Tillis (R-N.C.) voted with Democrats against Trump tariffs.

2) Romania: The House and Senate GOP chairs of the Armed Services committ

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