Did DOJ intentionally lie about "gun walking"?

In February, DOJ sent a letter to Senator Grassley denying that they ever walked guns. High level BATF officials were involved writing the letter and they surely knew about "Fast and Furious." From The Hill Newspaper:

. . . . In a February letter to the ranking Republican on the Senate Judiciary Committee, Sen. Chuck Grassley (Iowa), Weich wrote that the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) “makes every effort to interdict weapons that have been purchased illegally and prevent their transportation to Mexico.”

In his letter to Weich on Wednesday, Issa said he has documents indicating that high-level ATF and DOJ officials in multiple offices were involved in preparing and drafting the letter to Grassley, who launched Congress’ probe into the controversial Operation Fast and Furious.

Those officials, Issa said, had access to “reams of evidence that showed ATF did not make every effort to interdict weapons that have been purchased illegally and prevent their transportation to Mexico.”

Issa took Weich to task for the statements made in the letter to Grassley. In testimony before Issa’s committee in June, Weich accepted full responsibility for the contents of the letter.

“Mr. Weich, as you are well aware, it is a crime to knowingly make false statements to Congress,” Issa wrote on Wednesday.

“As the Department’s principal liaison to Congress, we rely on you to be straight with the facts. You have not been, and so your credibility on this issue has been seriously eroded.

“Whether it is the case that you were fed a lie and faithfully repeated it in a letter to Congress, or whether it is the case that you took the initiative to lie to Congress yourself, you are responsible for the contents of letters that bear your signature. The buck stops with you,” Issa said.

Issa asked Weich to give him by next Wednesday a complete list of everyone involved in preparing the letter, copies of communications discussing its preparation, and any existing earlier drafts of the letter. . . . .