"South Korea/Japan/Canada/France/Germany, if you're listening
maybe you could find and publish those missing Trump tax returns we'd all like to see."
That's what I'd be working on, if I had a position of authority in the intelligence services of any of those nations.
Now that Trump is selling them all out, I wonder if there's any reason for them NOT to mount an attack on Trump businesses and the GOP in general. Why not hack the e-mails of Trump family businesses, and do a data dump a la Wiki-leaks? The South Koreans, Japanese, French and German intelligence services have to be at least as good as the Russians at this sort of operation. And probably far better at covering their tracks.
So, to paraphrase a now infamous suggestion: "South Korea/Japan/Canada/France/Germany if you're listening, maybe you could find and publish those missing Trump tax returns we'd all like to see."
That CAN'T be an illegal suggestion, since, after all, the president of the United States said nearly the exact same thing.