"Michael Hayden on Acela giving reporters disparaging quotes about admin," Matzzie tweeted. "?'Remember, just refer as former senior admin.'?"
Someone eventually tipped off Hayden, who finished a call, stood up and walked over to Matzzie.
"Would you like a real interview?" Hayden asked.
"I'm not a reporter," Matzzie replied.
"Everybody's a reporter," Hayden said.
The Post said the two then talked about the U.S. Constitution's s Fourth Amendment, which prohibits unreasonable searches and seizures, and NSA surveillance, and then Hayden posed for a photo with Matzzie.
Hayden told the Post later he wasn't disparaging Obama or his administration. Matzzie "got it terribly wrong," Hayden said, dismissing the tweets as an inaccurate "story from a liberal activist sitting two seats from me on the train hearing intermittent snatches of conversation."
"I didn't criticize the president," Hayden said. "I actually said these are very difficult issues. I said I had political guidance, too, that limited the things that I did when I was director of NSA. Now that political guidance (for current officials) is going to be more robust. It wasn't a criticism."
Hayden retired as CIA director in 2009 and is now a top executive in the Chertoff Group, a national security consultancy.