The article points to several. It basically tells us it’s Kim Jong Un because Trump already publicly said he wouldn’t recruit his family as spies.
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The complaint was filed with Atkinson’s office on Aug. 12, a date on which Trump was at his golf resort in New Jersey. White House records indicate that Trump had had conversations or interactions with at least five foreign leaders in the preceding five weeks.
Among them was a call with Russian President Vladimir Putin that the White House initiated on July 31. Trump also received at least two letters from North Korean leader Kim Jong Un during the summer, describing them as “beautiful” messages. In June, Trump said publicly that he was opposed to certain CIA spying operations against North Korea. Referring to a Wall Street Journal report that the agency had recruited Kim’s half-brother, Trump said, “I would tell him that would not happen under my auspices.”