When Donald Trump, during his first stint as president, directed the assassination of a powerful Iranian general without the approval of Congress, a group of Republican senators joined with Democrats to send Trump a message: You will not go to war without our consent.

Many of those senators are still in office, and yet even as this Trump administration carries out deadly attacks on alleged drug smugglers and threatens the use of force to oust Venezuelan leader Nicolás Maduro, only two - Sen. Rand Paul (Kentucky) and Sen. Lisa Murkowski (Alaska) - have attempted again to stand in the president’s way.

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