Because Obama thinks he is above the law, he will just ignore it if it passes.
Via Daily Caller:
Republican Sen. Rand Paul of Kentucky is one of four senators on Capitol Hill who introduced a new bill Thursday that would block President Obama from getting involved in the Syrian civil war. [...]
The bill proposed Thursday would stop “the Central Intelligence Agency, the Department of Defense, or any other agency or entity of the United States involved in intelligence activities” from “supporting, directly or indirectly, military or paramilitary operations in Syria by any nation, group, organization, movement, or individual.”
“The President’s unilateral decision to arm Syrian rebels is incredibly disturbing, considering what little we know about whom we are arming,” Paul said Thursday.
Other sponsors include Democratic Sens. Tom Udall of New Mexico and Chris Murphy of Connecticut. Utah Sen. Mike Lee, a Republican, is also a sponsor.