The following article by Jon Greenberg was posted on the Politifact website May 22, 2018:
Informant, infiltration, spying. The words were thrown around freely as President Donald Trump tweeted his frustration with the FBI investigation of Russian involvement with his campaign.
“I hereby demand, and will do so officially tomorrow, that the Department of Justice look into whether or not the FBI/DOJ infiltrated or surveilled the Trump campaign for political purposes – and if any such demands or requests were made by people within the Obama Administration,” Trump tweeted May 20. Continue reading “Informants, infiltration and spying: Some definitions in the FBI investigation of team Trump”