A federal judge is warning she may order a new trial for a convicted Islamic scholar if the government refuses to turn over evidence possibly obtained from warrantless spying. The scholar, Ali Al-Timimi, was sentenced to life in prison two years ago for urging Muslims to join the Taliban in Afghanistan and fight US troops after the 9/11 attacks. Al-Timimi has long denied the charges and claims he may have been illegally wiretapped. His lawyers have been barred from a series of secret court appearances by intelligence officials arguing against his appeal.