The Senate took a historic vote on Tuesday.

For the first time since 2010, the chamber rejected a procedural measure to advance the National Defense Authorization Act (NDAA), the annual bill that sets the topline for defense spending.

The vote failed along party lines, with every Democrat present voting no. Democratic leadership cited the ongoing war on Iran as the primary justification for delaying the bill’s progress. In a statement released Tuesday afternoon, Senate Democratic Leader Chuck Schumer (D-N.Y.) wrote, “Donald Trump is dragging America deeper into a war in Iran with no authorization, no plan, and no exit strategy. Democrats will not go along.” The question is, for how long.

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