I don't think the technology of choice here is the problem. It's that the President doesn't care if he is compromised, but that he sold the nation on how unsafe Hillary would be with communications.

Pick any tech you like for the President's* phone calls, foreign governments will still listen because he simply doesn't care.

Edit: Also, why was Russia, the country that is actively attacking the US and has been for years, removed from the headline? Seems the most important part. (and don't tell me it doesn't fit, there's plenty of room).