According to the indictment, Rosen and Weissman conspired to obtain and then disseminate classified information on sensitive issues such as U.S. policy toward Iran, the status of U.S. counter-terrorism investigations in the Middle East and current intelligence on Al Qaeda and other terrorist networks.
After the arrests, Harman was recorded by court-approved wiretaps being used to investigate suspected Israeli intelligence-gathering in the United States. According to some reports, Harman, who was not the object of the wiretap, was said to have promised an Israeli operative that she would lobby officials for leniency for Rosen and Weissman.
Harman denied wrongdoing and demanded the release of transcripts of any wiretapped conversation in which she participated.
Then-CIA Director Porter J. Goss wanted to inform Congress about Harman's wiretap in accordance with a long-standing policy governing sensitive intelligence investigations, but was asked by then-Atty. Gen. Alberto R. Gonzales not to, according to a former senior intelligence official who spoke of internal discussions on condition of anonymity.
The prosecution of Rosen and Weissman continued without interference, several current and former federal law enforcement officials said.
The government's case began to falter in recent months, however, when lawyers for Rosen and Weissman won several key procedural rulings. The lobbyists won the right to subpoena as defense witnesses a number of former top Bush administration officials, including former Secretary of State Condoleezza Rice.
Defense lawyers Abbe Lowell and Baruch Weiss said their clients had met frequently with those officials. As witnesses, the officials would help prove that the Bush administration, like prior administrations, routinely discussed sensitive information with AIPAC as part of a sanctioned, back-channel relationship between the United States and Israel.
U.S. District Judge T.S. Ellis III also issued legal rulings that set a high bar for the prosecutors, including a requirement to prove that Rosen and Weissman knowingly meant to harm the United States or aid another country.
U.S. Atty. Dana J. Boente, the acting top federal prosecutor in the region, said the government was moving to dismiss the charges because of the additional legal burdens.
"When this indictment was brought, the government believed it could prove this case beyond a reasonable doubt based on the statute," Boente said, adding that there was a "diminished likelihood" the government could win now.
Lowell and another defense lawyer, John Nassikas III, praised the Obama administration for reviewing the case and denounced the previous administration's actions dating to the first FBI search at AIPAC's offices in 2004.
Rosen and Weissman may sue the government to recover legal costs, which are estimated at more than $10 million.
Many current and former federal law enforcement officials said the prosecution's case was strong and that there was proof the two lobbyists knew their actions were wrong.
"The judge had made so many adverse rulings that this was inevitable, but it grates on me," one former senior Justice Department official said of the decision to drop the case.
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josh.meyer@latimes.com