Even though Michael Flynn said he would testify about possible connections between Russian officials and the Trump campaign, a former top intelligence official claims that investigators would only give the former national security advisor a deal if he has evidence on someone high up the chain.

Jeremy Bash, former counsel to the House Intelligence Committee and former chief of staff for the Department of Defense and CIA, claims there’s only one person who matches the description.

“For the Justice Department to agree to give somebody like him immunity, it means they want him to turn and testify against someone higher up in the food chain,” Bash told MSNBC. “Who is higher up in the food chain, higher than the national security adviser? There’s really only one person, and so this shows that the jeopardy of criminal liability actually extends all the way to the top.”

Flynn’s offer to testify for immunity from criminal prosecution has yet to be accepted, which made Bash wonder, “Immunity from what? What is he in jeopardy of being prosecuted for?”

According to Bash, while receiving classified briefings for Trump’s campaign, Flynn still worked as a lobbyist for Turkey. It’s possible that he could be prosecuted under the Espionage Act for planning to give national security information to a foreign power.

“That is a major felony, and that is essentially treason,” Bash said.

“It would not surprise me at all if what the prosecutors said to Flynn’s lawyers is, ‘We haven’t reached any conclusions on the Russian matter, but we have your guy dead to rights for not registering under the laws requiring registration as a foreign agent and second of conspiring to engage in kidnapping — you better come in and make a deal,’” he said.

“You can only give somebody immunity, full immunity, if it’s worth it,” Bash said. “They have to believe it’s worth it in this case.”