Roger Stone, a 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 supporter and former adviser, compared the Republican presidential nominee's trip to Mexico this week to Richard Nixon's historic trip to China.

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"It's Nixonian. If Nixon can go to China, Trump can go to Mexico," Stone said in an interview with John Catsimatidis on "The Cats Roundtable" radio show.

President Richard Nixon became the first U.S. president to visit China in 1972, an important step in normalizing relations between the two countries.

Trump unexpectedly visited Mexico last week and met with President Enrique Peña Nieto.

"Both men proved that they could be civil, they could be productive, and they could work together to try to find solutions," Stone said.

"This was a tour de force for Trump, because he looks a lot more presidential than [Democratic nominee] Hillary [Clinton], who looks sweatier and sweatier as she tries to answer more questions about the Clinton Foundation.”

During the visit, Trump held a joint press conference with Peña Nieto and called for an end to the "humanitarian disaster" of illegal immigration.