He was a political operative whose task was to lay the groundwork for OTHERS to do the spying.
A "mole" or "plant" is someone who works inside an organization to gather information. If Halper never worked for the Trump campaign then he can't possibly be a "mole" or "plant."
12 posted on 05/19/2018 6:47:19 PM PDT by Alberta's Child
("I saw a werewolf drinking a pina colada at Trader Vic's.")