GBP/USD Lower, U.K. Supreme Court Rules Parliament Must Vote on Article 50

GBP/USD is trading at 1.2457, down 0.0056. The pair is trading choppy and just above the session lows. Britain's Supreme Court ruled this morning that the U.K. government must hold a vote in parliament before beginning the process of leaving the European Union, the start of the process to leave the E.U. is known as Article 50.