(CNN) - Attorney General Eric Holder may have known about a controversial gun-running operation in Mexico earlier than he said.
Documents leaked to CNN show Holder knew about operation "Fast and Furious" in 2010.
That's the program that came under fire earlier this year after it came out that ATFagents let thousands of weapons fall into the hands of Mexican drug cartels.
Back in March, Holder told congress he had only recently learned about what happened.
House republicans are asking for an investigation by a special counsel.
Copyright 2011 CNN. All rights reserved.