Con artist

That greedy con artist would swindle you at any cost.

He's the FBI agent antagonist in Catch Me If You Can (2002) opposite a buoyantly charming young Leonardo DiCaprio as con artist Frank Abagnale, but his character is more of a determined cat to Leo's mouse than a real foil; he's simply a prim Eisenhower-era man with a job to do.

Leavers will be attracted to that story because it spares them the discomfort of admitting that they voted for a con, and then made a prime minister of the con artist.