U.S. national security officials are reportedly ready to “go nuclear” after President Donald Trump’s latest attack on the intelligence community.

In a series of tweets on Tuesday and Wednesday, Trump insisted that the “real scandal” was not that former National Security Adviser Michael Flynn lied about his contact with Russia. Instead, the president blasted what he said were “un-American” leaks that led to Flynn’s ousting.

On Wednesday, former NSA intelligence analyst John Schindler provided some insight into the reaction of national security officials.

“Now we go nuclear,” he wrote on Twitter. “[Intelligence community] war going to new levels. Just got an senior [intelligence community] friend, it began: ‘He will die in jail.’”

“US intelligence is not the problem here,” Schindler added in another tweet. “The President’s collusion with Russian intelligence is. Many details, but the essence is simple.”