Senator Rand Paul of Kentucky on Thursday single-handedly delayed a bipartisan effort to quickly send $40 billion in aid to Ukraine, which Congress had tried to fast-track amid the escalating brutality of Russia’s war.
The Senate needed unanimous consent to waive procedural hurdles and approve the humanitarian and military aid package, which the House passed 368-to-57 on Tuesday. Mr. Paul, a Republican and a libertarian who generally opposes U.S. spending on foreign aid, objected, halting…