Since everything I have said has been publicly reported and common knowledge unless you listen to nothing but conservative daily news, and I already stated I knew this previously without needing to look up something specifically for this discussion, I'll at least give you the info for this. 

[quote]I heard about that but I didn't get a lot of details. What information was given to Russia, specifically? Who specifically was put into danger? [/quote] 

Because I believe it is very pertinent to know the details of it. 

It was an agent of the Isreali intelligence service who was working with the CIA to infiltrate ISIS. Donald Trump was bragging to Sergey Kislyak about the quality of intel he gets. It made public (to the Russians and the press) the information of the man's identity and/or workings. The CIA had to immediately call the Israelis to get that man out of there because he could very well have been exposed while within the inner workings of ISIS. 

Not only did this take them back in infiltration and put the man's life in danger, but it changes how the government now operates because usually the president is trusted with info like this. 

Also to add to that 
[quote]Requiring your subordinates to be economical with your time is a good thing, not a bad one. [/quote] 
It was about him paying attention, not being economic with his time. If he goes to Maralago for policy making and half his presidency is vacation, he's not pressed for time. 

[@Dark Wind] Like I said, I wasn't for Hillary.