Bush administration lawyers are heading to court to begin defending an estimated 200 lawsuits by Guantanamo Bay detainees.

Tuesday's hearing is the first hearing since the Supreme Court ruled last month that detainees can challenge their imprisonment in civilian courts. Officials are expecting hundreds of lawyers and spectators to attend.

Judges will eventually review the government's evidence and decide whether detainees are being lawfully imprisoned. The key issue Tuesday is when that review will begin.

The Justice Department proposes eight weeks to begin filing the evidence. Lawyers for the detainees say it should be faster.