https://en.m.wikipedia.org/wiki/Good_cop,_bad_cop

Good cop, bad cop, also informally called the Mutt and Jeff technique,[1] is a psychological tactic used in interrogation and negotiation, in which a team of two people take opposing approaches to the subject.[2] One interrogator adopts a hostile or accusatory demeanor, emphasizing threats of punishment, while the other adopts a more sympathetic demeanor, emphasizing reward, in order to convince the subject to cooperate.[3] It is an instance of the Reid technique.

https://en.m.wikipedia.org/wiki/Reid_technique

The Reid technique is a method of interrogation after investigation and behavior analysis. The system was developed in the United States by John E. Reid in the 1950s. Reid was a polygraph expert and former Chicago police officer. The technique is known for creating a high pressure environment for the interviewee, followed by sympathy and offers of understanding and help, but only if a confession is forthcoming. Since its spread in the 1970s, it has been widely utilized by police departments in the United States

尋問のテクニックだそうで。
尋問のテクニックを総裁選で使う国。