The key players in Trump and his supporters' "deep state" theory are all Republicans.
Rob Rosenstein and Christopher Wray were appointed by Trump, Jim Comey and Robert Mueller were appointed by Republican presidents and asked to stay on in their positions by Democratic presidents.
The whole point of Trump and his supporters' "deep state" theory is to divert attention away from Trump's deep corruption and Robert Mueller's investigation into Trump's probable obstruction of justice and involvement with Russian oligarchs.
Trump defenders: THIS BOMB IS GOING TO HIT IT WILL BE SO BIG IT WILL DESTROY MUELLER & OWN THE LIBS. [Bomb falls. Doesn’t detonate. Sand pours out of it. Wind blows. Coyote howls.] Trump defenders: OMG DID YOU SEE HOW THAT DESTROYED MUELLER & OWNED THE LIBS?!?