http://www.cbsnews.com/stories/2004/05/20/iraq/main618637.shtmlIt is also detailed here:
http://www.rotten.com/library/bio/misc/ahmed-chalabi/SNIP
According to unnamed "intelligence sources," who had started spilling their guts to every U.S. news organization inside the Beltway, Chalabi had jumped back into bed with his friends in Iran, tipping Iranian intelligence off to the fact that U.S. intelligence had cracked their ultrasecret cryptography. Chalabi reportedly told Iranian intelligence he had heard the information from a drunken American. Despite this fun tipoff, the Iranians were apparently not feeling especially charitable. The operatives wired the news back to Tehran -- specifically naming Chalabi and using the exact codes Chalabi had just told them were broken.
Even a paranoid has enemies, and that last bit did seem to be either pointlessly cruel or unforgivably careless. Either way, Chalabi mounted an aggressive defense, playing the martyr and loudly protesting that he had been framed unjustly.
The truth is still unfolding. But it was only one week later that CIA chief George Tenet, one possible candidate as a talkative "unnamed intelligence source," abruptly tendered his resignation to President Bush... just hours after National Security Director Condoleezza Rice announced to the press that Tenet would be investigating whether Chalabi had compromised U.S. national security interests. SNIP