The Obama Administration’s Long History of Weaponizing the Bureaucracy to Target its Political Opponents | American Center for Law and Justice:
"It is outrageous, unconscionable, and illegal. Even so, mounting evidence indicates that the Obama Administration and its loyalists had a habit of using information gleaned from classified foreign surveillance to smear and perhaps blackmail its political opponents. In fact, whether it’s the IRS scandal or spying on Israeli officials lobbying against the Iran nuclear deal, the practice didn’t begin in 2016.
Even if the original collection of information may have been legal, under current circumstances, the evidence shows that the subsequent unmasking, disclosure, and leaking constitutes an illegal abuse of power."