You could say the wall has been the centerpiece of Trump's presidential campaign.

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So when the GOP candidate flew to Mexico on Wednesday to visit with President Enrique Peña Nieto, many were curious whether Trump's plan for a wall along the U.S.-Mexico border would come up.

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"We did discuss the wall. We didn't discuss payment of the wall. That'll be for a later date," Trump said during a press conference following the meeting.

>> Full transcript: Here's what Donald Trump said about his immigration policy

Peña Nieto took to Twitter to disagree, writing, "At the beginning of the conversation with Donald Trump, I made it clear Mexico will not pay for the wall."

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>> Trump has made one thing clear: He's not softening on immigration

"And Mexico will pay for the wall. They don't know it yet, but they're gonna pay for the wall," Trump said later that evening at a campaign rally back in the U.S.

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Helen Gilbert places flowers on her brother Eurie Martin’s grave at Camp Spring Baptist Church in Sandersville. Her brother died eight years ago. Three former Washington County deputies are accused of causing his death and are set to stand trial Monday. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez