Former New York City Mayor Rudy Giuliani (R) said Sunday that Republican presidential nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE did not plan to discuss his proposal to build a wall along the southern border during a meeting with Mexican President Enrique Peña Nieto.

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“We had ground rules for this meeting,” Giuliani, a Trump adviser, said on CNN’s “State of the Union.” “One of the ground rules was we were not going to discuss paying for the wall, because that’s not something we’re going to agree about.”

Giuliani said the Trump team wanted to find “areas of common agreement” with Peña Nieto.

“Maybe the president’s staff didn’t brief him on it, maybe the president forgot it, but, I mean, he brought it up. It wasn’t right at the very beginning — it was sort of in the middle of a sentence. And I just briefly said, ‘That’s not on the table.’ And the reality is they have a disagreement on that,” Giuliani said.

Peña Nieto told Trump last week that Mexico would not pay for the wall.

"At the start of the conversation with Donald Trump I made it clear that Mexico will not pay for the wall," Peña Nieto wrote on Twitter after last week’s meeting.

"From there, the conversation addressed other subjects and developed in a respectful manner."

Trump said at a rally in Phoenix, Ariz., afterward that "they don't know it yet, but they're going to pay for it."