The timing of case is tricky: the process of briefing, arguing and deciding a case at the Supreme Court takes months. The justices are scheduled to end their work at the end of the month. And the ban, if it is allowed to be enforced, is proposed as temporary, just to give the government 90 days to study and implement new vetting procedures. Acting solicitor general Jeffrey Wall has said that the ruling in the Hawaii case has prevented the government from moving forward on those objectives.