Wiretaps.
WaPo, here on February 5th, in the "Style" section:
The breadth of the leaks has surprised — and, of course, delighted — journalists, who say it gives the public an unfiltered view of what those in power are thinking and doing. The leaks of Trump’s calls to Turnbull and Peña Nieto may have been the most surprising of all; it’s rare for transcripts of presidential phone calls or details of meetings with foreign leaders, especially potentially embarrassing exchanges, to leak so soon afterward.
