Donald TrumpDonald John TrumpChelsea Clinton announces birth of third child Ukrainian officials and Giuliani are sharing back-channel campaign information: report Trump attacks 'the Squad' as 'racist group of troublemakers' MORE departed from his prepared remarks Tuesday night to ad lib some toilet humor.

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The presumptive GOP nominee was trying to strike a more presidential tone after days of being criticized for his racially tinged comments about a federal judge's "Mexican heritage."

But Trump couldn't help darting off the script loaded into a prompter during a riff on trade. 

"On trade, America First means the American worker will have his or her job protected from unfair foreign competition. What's happening there is absolutely a disgrace," Trump told a crowd of supporters in New York.

A man in the audience shouted out, "No PPP," confusing it with TPP, the Trans-Pacific Partnership trade deal pushed by the Obama administration, which Trump vociferously opposes.

Trump replied, "No PPP. You're right about that." 

He then paused. 

"And you mean," Trump added, smiling, "no pee-pee."

Trump quickly returned to his prepared message. 

"We are only going to have great trade deals. We are not going to approve, as somebody just said, the Trans-Pacific Partnership, which is a disaster for our country. 

"If it's not a great deal for our country we will not sign it. ... We are suffering big league and it's getting worse."