Playing politics with Libya... oh, I mean Syria.

[Vast LWC]

Well that almost makes use of force legal then doesn't it.

Actually, it does in fact make it legal.

The War Powers Resolution requires the President to notify Congress within 48 hours of committing armed forces to military action and forbids armed forces from remaining for more than 60 days, with a further 30 day withdrawal period, without an authorization of the use of military force or a declaration of war. The resolution was passed by two-thirds of Congress, overriding a presidential veto.

War Powers Resolution - Wikipedia, the free encyclopedia

Since the president consulted with the Senate, that would in fact be "notifying Congress".

The question of Constitutionality arose after the 60 day mark.