Greg Miller

President Donald Trump revealed highly classified information to the Russian foreign minister and ambassador in a White House meeting, according to current and former US officials, who said Trump’s disclosures jeopardized a critical source of intelligence on the Islamic State.

The information the President relayed had been provided by a US partner through an intelligence-sharing arrangement considered so sensitive that details have been withheld from allies and tightly restricted even within the U.S. government, officials said. The partner had not given the United States permission to share the material with Russia, and officials said Trump’s decision to do so endangers cooperation from an ally that has access to the inner workings of the Islamic State. After Trump’s meeting, senior White House officials took steps to contain the damage, placing calls to the CIA and the National Security Agency. “This is code-word information,” said a US official familiar with the matter, using terminology that refers to one of the highest classification levels used by American spy agencies. President Trump “revealed more information to the Russian ambassador than we have shared with our own allies.”

US counterintelligence officials are sifting through intercepted communications and financial data as part of a wider look at possible ties between the Russian government and associates of President-elect Donald Trump, officials said. But while it has been clear for months that a broad investigation is underway, what remains murky — even to lawmakers receiving closed briefings — is its scope and target. It is unclear if the intercepts being examined have any connection to the Trump campaign. But the investigation adds to the uncertainty surrounding Trump’s relationship with Russia even as he is sworn in as president. U.S. intelligence agencies have already concluded that Russia interfered in the election to help Trump win. Trump’s former campaign chairman, Paul Manafort, has been under FBI scrutiny for some time, including for allegations of illegal financial dealings in Ukraine, current and former U.S. officials said. Manafort has done business in Russia and Ukraine. The Treasury Department’s Financial Crimes Enforcement Network, CIA and the National Security Agency, which intercepts phone calls, emails and other electronic communications of foreigners overseas, are also involved in the probe.