The White House is planning to curtail the distribution of classified intelligence to members of Congress, following the leak of a preliminary assessment on the consequences of U.S. strikes against Iran’s nuclear facilities, a senior official confirmed to NBC News.

According to the official, the U.S. government intends to reduce the volume of information shared via CAPNET, the secure platform used for transmitting classified documents to Congress.

The decision has already triggered strong backlash from Democratic lawmakers.

“The administration must immediately reverse this decision,” said Senate Minority Leader Chuck Schumer. “They don’t want the real facts to come out. They only want their version—Trump’s version—which we know often doesn’t reflect the truth.”

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Republicans, meanwhile, are focusing on the leak itself, specifically the preliminary report from the Defense Intelligence Agency (DIA), which concluded that Iran’s nuclear program had been delayed by only three to six months despite the strikes.

“The leak was dangerous and outrageous. We are working to identify who is responsible, and we will fix the problem,” said House Speaker Mike Johnson. When asked whether he suspects a member of Congress, he responded, “That’s my gut feeling.”

However, despite the White House’s tightening of procedures, there is currently no evidence indicating that a member of Congress was responsible for the leak.