“The FBI Informant Who Monitored the Trump Campaign, Stefan Halper, Oversaw a CIA Spying Operation in the 1980 Presidential Election”
https://theintercept.com/2018/05/19/the-fbi-informant-who-monitored-the-trump-campaign-stefan-halper-oversaw-a-cia-spying-operation-in-the-1980-presidential-election/