There has been zero evidence presented so far that it is in fact foreign governments doing any of this. More likely it's the vast cabal of Federal agencies in the greater DC area all disregarding the law because nobody in the US Congress has the will to rein them in. And of course for all we know, the espionage may be entirely legal courtesy of some clandestine national security FISA sign-off.

The US Government system is made up of dozens of extremely powerful agencies, and they are at war with each other at all times for power, information and budget. Sometimes that war is cold, sometimes it's warm.

Simply put, they're all spying on each other and all aspects of the system that is meant to control them (while they attempt to control the system instead).