Robert Diaz was an U.S Senator that was running for President of the United States. To this end, Diaz received 300,000,000 dollars from Constantin Rostov to finance his political campaign. Diaz won the election and became the President of The United States. During his time as a senator, Diaz was the chairman of the Senate Energy and Natural Resources Committee.
Diaz, now the current president, is convinced by Reddington to pardon Elizabeth Keen.
Diaz is revealed to be part of the conspiracy to destroy a dossier.
It is revealed that he tried to murder his wife using Milian Sandquist. She wanted to expose a manslaughter committed by him while he was driving under the influence after a celebration during the primary election.