Lawyers for an Army private who gave classified information to WikiLeaks have opened their defense at his court-martial in Maryland.

Attorneys for Pfc. Bradley Manning began presenting evidence Monday as the trial entered its sixth week at Fort Meade. They opened with video of a helicopter attack in Baghdad that Manning leaked.

Earlier Monday, Manning's defense team asked the military judge to acquit him of as many as seven charges for lack of incriminating evidence. The government has until Thursday to respond, then Col. Denise Lind will rule.