Moon over Parador

Moon over Parador is a 1988 American romantic comedy movie directed by Paul Mazursky and starring Richard Dreyfuss, Raul Julia, Lorin Dreyfuss, Dana Delany, Jonathan Winters, Fernando Rey, Sônia Braga, Polly Holliday, and Sammy Davis Jr.. It was distributed by Universal Pictures. 
Plot.
The story is about an American actor (Richard Dreyfuss) who is asked to impersonate the dictator (Lorin Dreyfuss) of the fictional South American country of Parador, after he dies of a heart attack, by the second man (Raul Julia) so he can take power and become the dictator of Parador himself.