The Washington Post initially reported that Trump passed highly classified information during his May 10 meeting with Russian foreign minister Sergey Lavrov and ambassador to the U.S. Sergey Kislyak.
'I never mentioned the word or the name Israel,' Trump said.
The New York Times reported May 16 that the information Trump provided came from Israel. The information was about an ISIS plot. Trump wrote on Twitter that he has an 'absolute right' to reveal information to fight terrorism.
'I never mentioned the word or the name Israel,' Trump said.
www.dailymail.co.uk/news/article-4531016/Trump-says-never-told-Russian-info-came-Israel.html
It appears this is what President Trump was referring to.