Spicer said he was not ready to comment on the alleged leak Tuesday. While he would not confirm the veracity of any of the information in the documents, Spicer said that President Trump would view them as dangerous if they are real.
"As you can imagine from the president’s previous comments [on leaks,] he is extremely concerned about this," Spicer said.
"Make no mistake about it, I think the president has talked before that anybody who leaks classified information will be held to the highest degree of law," he said.
Amidst swirling questions about Russia's interference in the 2016 election and alleged Trump associate contacts with suspected Russian officials during the campaign, Trump has decried leaks to the press and pushed for investigations into them.
That appears to strike a different tone from a campaign rally when Trump said "I love WikiLeaks!"
In the wake of the document release, the CIA released a statement declining to say whether the files were real or not.
"We do not comment on the authenticity or content of purported intelligence documents," said CIA spokesperson Jonathan Liu.