Källor: Trump spelar instabil för att skrämma Iran

The madman theory is a political theory commonly associated with the foreign policy of U.S. president Richard Nixon and his administration, who tried to make the leaders of hostile communist bloc countries think Nixon was irrational and volatile so that they would avoid provoking the U.S. in fear of an unpredictable response. The premise of madman theory is that the appearance of irrationality makes otherwise non-credible threats seem credible. For instance, in an era of mutually assured destruction, threats by a rational leader to escalate a dispute may seem suicidal and thus easily dismissible by adversaries. However, suicidal threats may seem credible if the leader is believed to be irrational. International relations scholars have been skeptical of madman theory as a strategy for success in coercive bargaining. Prominent "madmen", such as Nixon, Nikita Khrushchev, Saddam Hussein, Donald Trump, and Muammar Gaddafi failed to win coercive disputes. One difficulty is making others believe you are genuinely a madman. Another difficulty is the inability of a madman to assure others that they will not be punished if they yield to a particular demand. One study found that madman theory is frequently counterproductive, but that it can be effective under certain conditions. Another study found that there are both bargaining advantages and disadvantages to perceived madness.