“I think it is entirely plausible that Mr. Trump is somehow compromised by his personal and financial dealings with Russia and Russians, but I do not think he is an “agent” in the sense that intelligence professionals use the term. Let me explain.
Intelligence and law enforcement professionals ascribe specific meanings to those who work on their behalf. Unfortunately, the term “agent” is less clear than some others. For example, the FBI calls its officers agents, while CIA officers never refer to themselves as agents, and instead reserve the term for those foreigners who spy on its behalf. The Russian services, on the other hand, approach human espionage operations differently from intelligence services in the West.”