Obama's plot against President Trump was implemented by Brennan (CIA) and Comey (FBI).
The Russiagate plot was launched out of London, England, to give Obama implausible deniability.
Gina Haspel, CIA station chief in London, and Alan Kohler, FBI representative in London (LEGAT), carried it out.
Their agents Christopher Steele (MI6, British intelligence) and Stefan Halper (CIA, FBI, MI6), were on the books, paid by the CIA and the FBI, and coordinated the anti-Trump operation.