Of course the phones are tapped. And they likely dropped small root kit malware in every single electronic piece of equipment in the WH before they left, all the way down to wireless printers or even doorbells. You can change every piece of computer equipment in the building but all it takes is one missed device with enough memory and wireless capability to later phone home and/or communicate with the new, “pristine” equipment and escalate privileges from there. Unless someone LOYAL TO TRUMP is head of the Trump security team, the listeners can hear everything in every room that has a device with a microphone. (Cell phones, computers, security monitoring devices, TVs, etc.)
Or is could simply be NSA who’re working for the Deep State.
Well wikileaks has been giving us a taste of the intel community’s toolkit. We probably can’t imagine some of their capabilities.