[A] number of defense lawyers said in interviews that circumstantial evidence had led them to question whether the security agency identified their clients through wiretaps.I think if there is to be a lawsuit examining the legality of the surveillance, it will be in this form, not in a suit brought by a member of Congress (who would not have standing to sue).
The first challenge is likely to come in Florida, where lawyers for two men charged with Jose Padilla, who is jailed as an enemy combatant, plan to file a motion as early as next week to determine if the N.S.A. program was used to gain incriminating information on their clients and their suspected ties to Al Qaeda. Kenneth Swartz, one of the lawyers in the case, said, "I think they absolutely have an obligation to tell us" whether the agency was wiretapping the defendants. In a Virginia case, Edward B. MacMahon Jr., a lawyer for Ali al-Timimi, a Muslim scholar in Alexandria who is serving a life sentence for inciting his young followers to wage war against the United States overseas, said the government's explanation of how it came to suspect Mr. Timimi of terrorism ties never added up in his view.
F.B.I. agents were at Mr. Timimi's door days after the Sept. 11 attacks to question him about possible links to terrorism, Mr. MacMahon said, yet the government did not obtain a warrant through the foreign intelligence court to eavesdrop on his conversations until many months later.
Mr. MacMahon said he was so skeptical about the timing of the investigation that he questioned the Justice Department about whether some sort of unknown wiretap operation had been conducted on the scholar or his young followers, who were tied to what prosecutors described as a "Virginia jihad" cell.
"They told me there was no other surveillance," Mr. MacMahon said. "But the fact is that the case against a lot of these guys just came out of nowhere because they were really nobodies, and it makes you wonder whether they were being tapped."...
Because the program was so highly classified, government officials say, prosecutors who handled terrorism cases apparently did not know of the program's existence. Any information they received, the officials say, was probably carefully shielded to protect the true source.
But defense lawyers say they are eager to find out whether prosecutors - intentionally or not - misled the courts about the origins of their investigations and whether the government may have held on to N.S.A. wiretaps that could point to their clients' innocence.
UPDATE: For analysis of the legal problems facing the defense lawyers and prosecutors, see Jeralyn Merritt and Reddhedd.