A letter from George H.W. Bush to Bill Clinton is going viral this morning after Donald Trump refused to commit to accepting the outcome of the presidential election.

Trump, who has spoken of a "rigged" political system and suggested widespread voter fraud could be committed on Election Day, said at the debate, "I'll keep you in suspense" on whether he will accept the results. 

Hillary Clinton called Trump's comments about the election "horrifying" and argued that every time a decision goes against him, Trump claims it's "rigged."

The letter from the loser of the 1992 presidential election to the incoming commander-in-chief is being held up as an example of political civility. 

Bush left the letter in the Oval Office on January 20, 1993 as Bill Clinton prepared to be inaugurated. 

"I wish you great happiness here," Bush wrote, advising Clinton not to let critics "discourage you or push you off course."

"You will be our president when you read this note," he wrote, underlining the word "our."

"Your success now is our country's success. I'm rooting hard for you," he ended the note.

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