Trump in 2013: We must 'leave borders behind' because future of US 'depends on a cohesive global economy'

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Donald Trump, who has championed anti-free trade and hardline immigration rhetoric on the 2016 presidential campaign trial, took a starkly different tone toward globalization in a 2013 op-ed published on CNN's website.

The Republican presidential nominee, writing about how Europe was a "terrific place" for investment, argued at the time that the 2008 recession had made it clear "the global economy has become truly that — global."

Trump wrote that "cultures and economics are intertwined" in today's society and that it was necessary to "work with each other for the benefit of all."

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Donald Trump through the years
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Donald Trump through the years
Real estate developer Donald Trump annouces intentions to build a $100 million dollar Regency Hotel. (Photo by John Pedin/NY Daily News via Getty Images)
UNITED STATES - MARCH 02: Donald Trump with Alfred Eisenpreis, New York City Economic Development Administrator. Sketch of new 1,400 room Renovation project of Commodore Hotel. (Photo by NY Daily News Archive via Getty Images)
NEW YORK, NY - 1980: Donald Trump and Ivana Trump attend Roy Cohn's birthday party in February 1980 in New York City. (Photo by Sonia Moskowitz/Getty Images)
UNITED STATES - MAY 26: Donald Trump stands behind architect's model of City Hall Plaza. (Photo by Frank Russo/NY Daily News Archive via Getty Images)
Donna Mills and Donald Trump during 1983 Annual American Image Awards at Sheraton Center in New York City, New York, United States. (Photo by Ron Galella, Ltd./WireImage)
Portrait of real estate mogul Donald John Trump (b.1946), smiling slightly and facing to his right, 1983. New York. (Photo by Bachrach/Getty Images)
New York real estate magnates Steve Ross, right, and Donald Trump, left, announce agreement, Thursday, August 1, 1985 in New York, to merge the Houston Gamblers and the New Jersey Generals United States Football League teams. Ross heads a group of investors that last week agreed to buy the troubled Houston franchise. (AP Photo/Marty Lederhandler)
Real estate magnate Donald Trump poses in front of one of three Sikorsky helicopters at New York Port Authority's West 30 Street Heliport on March 22, 1988. (AP Photo/Wilbur Funches)
Ivana Trump and Donald Trump during Mike Tyson vs Michael Spinks Fight at Trump Plaza - June 27, 1988 at Trump Plaza in Atlantic City, New Jersey, United States. (Photo by Ron Galella/WireImage)
Donald Trump and his wife, Ivana, pose outside the Federal Courthouse after she was sworn in as a United States citizen, May 1988. (AP Photo)
NEW YORK, NY - DECEMBER 4: Billionaire Donald Trump and his wife Ivana arrive 04 December 1989 at a social engagement in New York. (Photo credit should read SWERZEY/AFP/Getty Images)
Shown in photo is Donald Trump, Nov. 20, 1990. (AP Photo/Mark Lennihan)
Billionaire developer Donald Trump, right, waits with his brother Robert for the start of a Casino Control Commission meeting in Atlantic City, N.J., March 29, 1990. Trump was seeking final approval for the Taj Mahal Casino Resort, one of the world's largest casino complexes. (AP Photo)
Developer Donald Trump, center, is flanked by super middleweight champion Thomas Hearns, left, of Detroit, and Michael Olajide of Canada at a news conference in New York Thursday, Feb. 15, 1990. The three announced the super middleweight title bout at Trump Taj Mahal Casino Resort at Atlantic city, N. J on April 28.(AP Photo/Timothy Clary)
Real estate magnate Donald Trump and his girlfriend Marla Maples are seen at the Holyfield-Foreman fight at Trump Plaza in Atlantic City, N.J., April 19, 1991. (AP Photo)
Donald Trump and Daughter Ivanka Trump during Maybelline Presents 1991 Look of the Year at Plaza Hotel in New York City, New York, United States. (Photo by Ron Galella/WireImage)
NEW YORK, NY - APRIL 7: Donald Trump touches 07 April 1993 Marla Maples stomach to confirm published reports that the actress is pregnant with his child. The two arrived for Maples appearance in the Broadway musical 'The Will Rogers Follies'. (Photo credit should read HAI DO/AFP/Getty Images)
NEW YORK, NY - DECEMBER 21: US business tycoon Donald Trump(C) enters the PLaza Hotel in New York past supporters 21 December 1994. Hundreds of supporters showed up at a news conference where Trump denied a New York newspaper report that the Sultan of Brunei had bid 300 million USD to buy the Manhattan hotel. (Photo credit should read DON EMMERT/AFP/Getty Images)
FILE--This is a 1994 file photo of Donald Trump. Trump said Wednesday, Oct. 23, 1996 he has bought the Miss Universe, Miss USA and Miss Teen beauty pageants from ITT. ``It's a done deal,'' Trump said in a telephone interview. ``It's a very, very great entertainment format. It gets very high ratings, it's doing very well and we'll make it even better.'' Trump declined to say how much he paid. Asked if a New York Post source was correct in saying the deal was worth tens of millions of dollars, Trump replied, ``Why not? (AP Photo/Jim Cooper)
FLUSHING MEADOWS, UNITED STATES: Donald Trump and his girlfriend Celina Midelfar watch Conchita Martinez and Amanda Coetzer 07 September at US Open in Flushing Meadows, NY. AFP PHOTO Timothy CLARY (Photo credit should read TIMOTHY CLARY/AFP/Getty Images)
Donald Trump and Christine Whitman during Opening of New Warner Bros. Store in Trump Plaza Casino at Trump Plaza Casino in Atlantic City, New Jersey, United States. (Photo by Ron Galella/WireImage)
In this June 7, 1995 file photograph, Donald Trump is seen above the floor of the New York Stock Exchange after taking his flagship Trump Plaza Casino public in New York City. Trump Entertainment Resorts Inc., based in Atlantic City, New Jersey, filed for Chapter 11 protection on Tuesday, Feb. 17, 2009, in the U.S. Bankruptcy Court in New Jersey. Trump and his daughter Ivanka resigned from the company's board Friday, Feb. 13, 2009, after growing frustrated with bondholders. (AP Photo/Kathy Willens,File)
Celine Dion, husband Rene, Donald Trump & Ivanka Trump (Photo by KMazur/WireImage)
Entrepreneur Donald Trump watches an undercard fight as an unidentified companion whispers into his ear before the start of the Mike Tyson versus Francois Botha bout at the MGM Grand Hotel & Casino in Las Vegas, Nevada, Saturday, Jan. 16, 1999. (AP Photo/Eric Draper)
Developer Donald Trump holds an umbrella as he walks Saturday, Nov. 9, 2002, to the 11th green of the Ocean Trail Golf Club in Rancho Palos Verdes, Calif. Trump plans to turn the beleagured golf club into a world class course. Trump intends to close on the golf club by December and hopes to begin improvements by January. He could reopen the course, 20 miles south of Los Angeles, as early as June. (AP Photo/Damian Dovarganes)
Entrepreneur Donald Trump (L) and Rev. Al Sharpton speak at a ribbon cutting ceremony for Sharpton's National Action Network Convention April 5, 2002 in New York City. The group aims to further the development of civil rights. (Photo by Mario Tama/Getty Images)
Donald Trump and his girlfriend Melania Knauss attend the Marc Bouwer/Peta Fall/Winter 2002 Collection show February 14, 2002 during Mercedes-Benz Fashion Week in New York City. (Photo by George De Sota/Getty Images)
NEW YORK, UNITED STATES - DECEMBER 06: WBC Kampf im Schwergewicht 2003, New York/Madison Square Garden; Vitali KLITSCHKO/UKR - Kirk JOHNSON/CAN; Donald TRUMP als Zuschauer (Photo by Alexander Hassenstein/Bongarts/Getty Images)
FOXBORO, MA - JANUARY 10: Donald Trump stands on the sidelines before the start of the AFC divisional playoffs between the New England Patriots and Tennessee Titans on January 10, 2004 at Gillette Stadium in Foxboro, Massachusetts. Temperatures have reached as low as 7 degrees in the Foxboro area. (Photo by Al Bello/Getty Images)
US tycoon Donald Trump arrives to speak at the annual Conservative Political Action Conference (CPAC) at National Harbor, Maryland, outside Washington, on February 27, 2015. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
NASHVILLE, TN - APRIL 10: Donald Trump speaks during the NRA-ILA Leadership Forum at the 2015 NRA Annual Meeting & Exhibits on April 10, 2015 in Nashville, Tennessee. The annual NRA meeting and exhibit runs through Sunday. (Photo by Justin Sullivan/Getty Images)
WASHINGTON, DC - MARCH 24: Real estate mogul and billionaire Donald Trump attends Golf legend Jack Nicklaus' Congressional Gold Medal ceremony in the U.S. Capitol Rotunda March 24, 2015 in Washington, DC. Trump announed on March 18 that he has launched a presidential exploratory committee. (Photo by Chip Somodevilla/Getty Images)
DES MOINES, IA - MAY 16: Businessman Donald Trump speaks to guests gathered for the Republican Party of Iowa's Lincoln Dinner at the Iowa Events Center on May 16, 2015 in Des Moines, Iowa. The event sponsored by the Republican Party of Iowa gave several Republican presidential hopefuls an opportunity to strengthen their support among Iowa Republicans ahead of the 2016 Iowa caucus. (Photo by Scott Olson/Getty Images)
Developer Donald Trump displays a copy of his net worth during his announcement that he will seek the Republican nomination for president, Tuesday, June 16, 2015, in the lobby of Trump Tower in New York. (AP Photo/Richard Drew)
Republican presidential hopeful Donald Trump gives a thumbs up before boarding his campaign plane to depart from Laredo, Texas, Thursday, July 23, 2015. (AP Photo/LM Otero)
AYR, SCOTLAND - JULY 30: Republican Presidential Candidate Donald Trump visits his Scottish golf course Turnberry with his children Ivanka Trump and Eric Trump on July 30, 2015 in Ayr, Scotland. Donald Trump answered questions from the media at a press conference. (Photo by Jeff J Mitchell/Getty Images)
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"My concern is that the negligence of a few will adversely affect the majority," he wrote.

Trump continued: "In this case, the solution is clear. We will have to leave borders behind and go for global unity when it comes to financial stability."

The real-estate mogul concluded his op-ed writing that the future of the US and Europe "depends on a cohesive global economy."

"All of us must work together toward that very significant common goal," he declared.

Trump has been a strong critic of trade treaties, opposing the proposed Trans-Pacific Partnership deal and North Atlantic Free Trade Alliance, often finding himself at odds with members of his own party to do so. He has also cheered Great Britain's vote to leave the European Union, claiming parallels between his own political rise and the so-called Brexit.

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And the billionaire has recently skewered his Democratic rival, Hillary Clinton, for privately expressing a desire for a borderless hemisphere, despite writing in his 2013 op-ed that it would be necessary to "leave borders behind."

A spokesperson for the Trump campaign did not immediately respond to a request for comment.

The unearthed comments came just hours before Trump was set to face off with Clinton in the final presidential debate. On Wednesday, he trailed the former secretary of state by 6.9 points in the RealClearPolitics national average.

Related: See Trump and Clinton at the last debate:

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Donald Trump, Hillary Clinton take the stage for the second presidential debate
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Donald Trump, Hillary Clinton take the stage for the second presidential debate
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton acknowledge each other at the start of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton stand together at the start of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton appear together during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Mike Segar
Republican U.S. presidential nominee Donald Trump listens as Democratic U.S. presidential nominee Hillary Clinton speaks during their presidential town hall debate with at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Democratic U.S. presidential nominee Hillary Clinton speaks during their presidential town hall debate with Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Republican U.S. presidential nominee Donald Trump speaks at the start of the second U.S. presidential town hall debate between Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens and takes notes during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump turns his back as Democratic U.S. presidential nominee Hillary Clinton talks about his comments about women during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Bourg
Moderators Anderson Cooper and Martha Raddatz speak before the start of the second U.S. presidential debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Melania Trump, Ivanka Trump, Eric Trump and Donald Trump Jr. stand before the presidential town hall debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016.
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton acknowledge each other at the start of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Republican U.S. presidential nominee Donald Trump speaks during the second U.S. presidential town hall debate between Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Democratic U.S. presidential nominee Hillary Clinton speaks during the second U.S. presidential town hall debate between Clinton and Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate with Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Rick Wilking
The family of U.S. Republican presidential nominee Donald Trump, (L-R) Melania, Ivanka, Eric and Donald Jr. wait for the presidential town hall debate with U.S. Democratic presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S. October 9, 2016. REUTERS/Brian Snyder
Marc Mezvinsky, Chelsea Clinton and Former U.S. President Bill Clinton sit at the presidential town hall debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Bourg
Republican U.S. presidential nominee Donald Trump listens as Democratic nominee Hillary Clinton answers a question from the audience during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Rick Wilking
Democratic U.S. presidential nominee Hillary Clinton speak during her debate against Republican U.S. presidential nominee Donald Trump (L) at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump speaks during his presidential town hall debate against Democratic U.S. presidential nominee Hillary Clinton (not shown) at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Aaron P. Bernstein
Republican presidential nominee Donald Trump listens to Democratic presidential nominee Hillary Clinton during the second presidential debate at Washington University in St. Louis, Sunday, Oct. 9, 2016. (AP Photo/Patrick Semansky)
Republican presidential nominee Donald Trump speaks to Democratic presidential nominee Hillary Clinton during the second presidential debate at Washington University in St. Louis, Sunday, Oct. 9, 2016. (AP Photo/John Locher)
Anderson Cooper, of CNN, and Martha Raddatz, of ABC News, moderate the second presidential debate between Republican presidential nominee Donald Trump and Democratic presidential nominee Hillary Clinton at Washington University in St. Louis, Sunday, Oct. 9, 2016. (Jim Bourg/Pool via AP)
Republican U.S. presidential nominee Donald Trump speaks during the presidential town hall debate with Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton speak during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY
U.S. Democratic presidential nominee Hillary Clinton and her husband, former U.S. President Bill Clinton, board her campaign plane after the presidential town hall debate against U.S. Republican presidential nominee Donald Trump in St. Louis, Missouri, U.S. October 9, 2016. REUTERS/Brian Snyder
Former U.S. President Bill Clinton watches as Republican U.S. presidential nominee Donald Trump (L) and his wife, Democratic U.S. presidential nominee Hillary Clinton, participate in their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Shannon Stapleton
Democratic U.S. presidential nominee Hillary Clinton speaks during their presidential town hall debate with Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump speaks during the presidential town hall debate with Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Shannon Stapleton
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton pause at the conclusion of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Democratic U.S. presidential nominee Hillary Clinton speaks during the presidential town hall debate with Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump listens as Democratic U.S. presidential nominee Hillary Clinton speaks during their presidential town hall debate with at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Shannon Stapleton
(L-R) Kathleen Willey, Juanita Broaddrick and Kathy Shelton sit together in the audience before Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton begin their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Mike Segar
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump's daughters-in-laws Lara Trump, Vanessa Trump and daughter Tiffany Trump (L-R) are seated at the start of the second U.S. presidential town hall debate between Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Chelsea Clinton and Former U.S. President Bill Clinton arrive at the presidential town hall debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Rick Wilking
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton face the audience during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump looks at Democratic U.S. presidential nominee Hillary Clinton during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY
Republican U.S. presidential nominee Donald Trump is seen during his presidential town hall debate against Democratic U.S. presidential nominee Hillary Clinton (not shown) at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Journalists Anderson Cooper and Martha Raddatz prepare to moderate the presidential town hall debate between U.S. Democratic presidential nominee Hillary Clinton and U.S. Republican presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S. October 9, 2016. REUTERS/Brian Snyder
Democratic U.S. presidential nominee Hillary Clinton makes her opening remarks at the start of the second U.S. presidential town hall debate between Clinton and Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton take the stage at the start of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Bourg
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton shake hands at the end of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY
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