Nothing surprising here - we’ve known this since he outed the Israeli agent in ISIS, and then last week tweeted an iPhone photo of a spy satellite image.
And it’s not illegal - the president gets to determine what is classified.
He is just untrustworthy. Which is really depressing.
Link: https://www.nytimes.com/2019/09/09/us/politics/cia-informant-russia.html?smid=nytcore-ios-share