Jonathan Pollard speaks during an interview in May 1998 in a conference room at the Federal Correction Institution in Butner, NC. President Bill Clinton rejected Prime Minister Benjamin Netanyahu's request to free Pollard, in jail for spying on the United States for Israel. Karl DeBlaker/AP
Former CIA officer Valerie Plame speaks at an annual 'power lunch' hosted by Illinois Rep. Jan Schakowsky, May 9, 2008, in Chicago. Plame's leaked covert identity sparked a federal probe, and resulted in the conviction of Vice President Dick Cheney chief of staff, Scooter Libby, of perjury, obstruction, and lying to the FBI. M. Spencer Green/AP
In this file image made from video released by WikiLeaks on October 11, 2013, former National Security Agency systems analyst Edward Snowden speaks during a presentation ceremony for the Sam Adams Award in Moscow. In an interview with the New York Times posted to its website on October 17, 2013, Snowden says that he did not take any secret NSA documents to Russia and that intelligence officials in China as well as Russia could not get access to the documents he had obtained before leaving the United States. Snowden has leaked several reports of spying on the part of the United States. AP
Hezbollah fighters parade during a rally to mark the Hezbollah martyr day, in the southern suburb of Beirut, Lebanon, Nov. 11, 2011. Current and former US officials say the CIA's operations in Lebanon have been badly damaged after Hezbollah identified and captured a number of US spies recently. Bilal Hussein/AP/File
Hezbollah leader Sheik Hassan Nasrallah speaks during a July 2, 2011 broadcast on Al-Manar TV during which he defended the men indicted in the murder of a former prime minister of Lebanon. Current and former US officials say the CIA's operations in Lebanon have been badly damaged after Hezbollah identified and captured a number of US spies recently. Al-Manar TV/AP
Alfredo Astiz, a 59-year-old former navy spy nicknamed 'the Angel of Death,' looks on as he waits for the verdict during his trial in a courtroom in Buenos Aires, Argentina, Oct. 26, 2011. Astiz is accused of participating in the disappearance, torture, and murder of two French nuns, a journalist and three founders of a human rights group that he infiltrated while spying for the dictatorship. Victor R. Caivano/AP
Peruvian journalist Vicky Pelaez on assignment in Lima, Peru. Pelaez and her husband Juan Lazaro were among 10 suspects arrested in a sweep in the United States on June 27, 2010, as part of an alleged Russian spy ring and charged with conspiracy to act as an agent of a foreign government without notifying the US Attorney General, which carries a maximum penalty of five years in prison upon conviction. Diario La Republica/AP
This June 20, 2004, image released by the Federal Bureau of Investigation on Oct. 31, shows an FBI surveillance photo of Richard Murphy in Columbus Circle, New York. Murphy of Montclair, N.J., was one of a ring of Russian sleeper spies shut down by federal counterintelligence agents in June of 2010 in a case code-named 'Ghost Stories.' The arrest led two weeks later to the biggest spy swap between the US and Russia since the Cold War. FBI/AP
This image taken from the Russian social networking website 'Odnoklassniki,' or Classmates, shows Anna Chapman, who was one of nine suspects who pleaded guilty to procuring information in the United States for the Russian government. AP/File
Harold J. Nicholson, of Burke, Va., a 16-year CIA veteran, was charged November 18, 1996 with selling top secrets to the Russians for more than $120,000 since June, 1994. The FBI suspects that the highest-ranking CIA officer to ever face espionage charges sold the identities of all new CIA agent trainees in the last two years. Central Intelligence Agency/AP
Robert Hanssen: A career counterintelligence agent who pursued Russian spies for the FBI, he spied for the Russians from 1985 to 2000, passing along thousands of documents and the names of at least two double agents. Hanssen is now serving a life sentence in solitary confinement in a 'supermax' prison in Florence, Colo. His story was made into the 2007 film Breach, starring Chris Cooper. Hanssen's photo is seen here during a news conference in February 2001 in Washington, DC. Andy Nelson/The Christian Science Monitor/FILE
Russian newspaperman Richard Sorge, who did espionage for the Russian government during World War II and was later executed by the Japanese, is shown on February 21, 1947. AP
Jonathan Pollard supporters say the spy did nothing but help an ally, Israel, and clemency could help Middle East peace talks. Critics say Pollard did serious damage to US intelligence and his release would gain nothing.
The United States is talking with Israel about releasing convicted spy Jonathan Pollard to the Israeli government as an incentive to keep troubled Middle East peace negotiations going, according to the Associated Press and other US and Israeli media reports.