Notable breach of protocolThe notion of world leaders calling each other up via cellphone may seem unremarkable in the modern, mobile world. Even if Trump uses his government-issued cellphone, his calls are vulnerable to eavesdropping, particularly from foreign governments, national security experts say. Trump's White House is already facing scrutiny for apparent efforts to work outside usual diplomatic channels. The White House has said such back channel communications are useful and discreet. Trump has struggled more than most recent presidents to keep his conversations with world leaders private.

Source: CBC News May 31, 2017 03:09 UTC