"We should stipulate that every intelligence service —not just ours, but every European intelligence service, every Asian intelligence service, wherever there's an intelligence service — here's one thing that they're going to be doing: They're going to be trying to understand the world better, and what's going on in world capitals around the world," he said. "If that weren't the case, then there'd be no use for an intelligence service."
Obama said the Europeans "are some of the closest allies that we have in the world." But he added, "I guarantee you that in European capitals, there are people who are interested in, if not what I had for breakfast, at least what my talking points might be should I end up meeting with their leaders. That's how intelligence services operate."
https://www.cleveland.com/world/index.ssf/2013/07/obama_suggests_everyone_spies.html
they probably wanted to know what Trump had for breakfast according to Obama