President Obama's plan to allow some 4 million undocumented immigrants to stay in the U.S. via executive action goes before the eight-member Supreme Court today, starting at 10 a.m. ET. A split decision will be a victory for Texas, where a federal judge put a stop to the plan, and the 25 other states that joined in opposing the executive action. However, states and cities may continue to push for the changes, setting off what immigration lawyer David Leopold called “a judicial mess.” A ruling is expected by June, which would give the president just seven months to execute the initiatives before leaving office.