President Trump was reportedly an 'anonymous source' for the National Enquirer

Since President Donald Trump took office, he has constantly called out multiple news outlets claiming they release fake news.

In one tweet sent out in May, Trump wrote,"Whenever you see the words 'sources say' in the fake news media, and they don't mention names... it is very possible that those sources don't exist but are made up by fake news writers. #fakenews is the enemy!"

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Trump stuns reporters with 'bizarre' cabinet meeting
U.S. President Donald Trump speaks during a meeting with Cabinet members at the White House in Washington, D.C., U.S., on Monday, June 12, 2017. U.S. Attorney General�Jeff Sessions�will testify publicly Tuesday before the Senate Intelligence Committee, a high-stakes event that comes days after fired FBI Director�James Comey's�dramatic appearance. Photographer: Olivier Douliery/Pool via Bloomberg
Steven Mnuchin, U.S. Treasury secretary, center, speaks during a meeting with U.S. President Donald Trump, not pictured, and Cabinet members at the White House in Washington, D.C., U.S., on Monday, June 12, 2017. U.S. Attorney General�Jeff Sessions�will testify publicly Tuesday before the Senate Intelligence Committee, a high-stakes event that comes days after fired FBI Director�James Comey's�dramatic appearance. Photographer: Olivier Douliery/Pool via Bloomberg
Jeff Sessions, U.S. attorney general, listens during a meeting with U.S. President Donald Trump, not pictured, and Cabinet members at the White House in Washington, D.C., U.S., on Monday, June 12, 2017. Sessions�will testify publicly Tuesday before the Senate Intelligence Committee, a high-stakes event that comes days after fired FBI Director�James Comey's�dramatic appearance. Photographer: Olivier Douliery/Pool via Bloomberg
U.S. President Donald Trump smiles during a meeting with Cabinet members at the White House in Washington, D.C., U.S., on Monday, June 12, 2017. U.S. Attorney General�Jeff Sessions�will testify publicly Tuesday before the Senate Intelligence Committee, a high-stakes event that comes days after fired FBI Director�James Comey's�dramatic appearance. Photographer: Olivier Douliery/Pool via Bloomberg
Jeff Sessions, U.S. attorney general, speaks during a meeting with U.S. President Donald Trump, not pictured, and Cabinet members at the White House in Washington, D.C., U.S., on Monday, June 12, 2017. Sessions�will testify publicly Tuesday before the Senate Intelligence Committee, a high-stakes event that comes days after fired FBI Director�James Comey's�dramatic appearance. Photographer: Olivier Douliery/Pool via Bloomberg
Steve Bannon, chief strategist for U.S. President Donald Trump, left, and Jared Kushner, senior White House adviser, listen during a meeting with U.S. President Donald Trump, not pictured, and Cabinet members at the White House in Washington, D.C., U.S., on Monday, June 12, 2017. U.S. Attorney General�Jeff Sessions�will testify publicly Tuesday before the Senate Intelligence Committee, a high-stakes event that comes days after fired FBI Director�James Comey's�dramatic appearance. Photographer: Olivier Douliery/Pool via Bloomberg
U.S. President Donald Trump, center left, speaks during a meeting with Cabinet members at the White House in Washington, D.C., U.S., on Monday, June 12, 2017. U.S. Attorney General�Jeff Sessions�will testify publicly Tuesday before the Senate Intelligence Committee, a high-stakes event that comes days after fired FBI Director�James Comey's�dramatic appearance. Photographer: Olivier Douliery/Pool via Bloomberg
U.S. President Donald Trump speaks during a meeting with Cabinet members at the White House in Washington, D.C., U.S., on Monday, June 12, 2017. U.S. Attorney General�Jeff Sessions�will testify publicly Tuesday before the Senate Intelligence Committee, a high-stakes event that comes days after fired FBI Director�James Comey's�dramatic appearance. Photographer: Olivier Douliery/Pool via Bloomberg
U.S. President Donald Trump speaks during a meeting with Cabinet members at the White House in Washington, D.C., U.S., on Monday, June 12, 2017. U.S. Attorney General�Jeff Sessions�will testify publicly Tuesday before the Senate Intelligence Committee, a high-stakes event that comes days after fired FBI Director�James Comey's�dramatic appearance. Photographer: Olivier Douliery/Pool via Bloomberg
White House chief strategist Steve Bannon (L) and Jared Kushner, son-in-law and senior adviser to US President Donald Trump, attend a cabinet meeting at the White House in Washington, DC, on June 12, 2017. / AFP PHOTO / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
WASHINGTON, DC - JUNE 12: (AFP OUT) U.S. Preisdent Donald Trump speaks during a meeting in the Cabinet Room of the White House June 12, 2017 in Washington, DC. Also in attendence was U.S. Attorney General Jeff Sessions who is expected to testify in an open hearing before Senate Intelligence Committee about his contacts with Russian officials during the 2016 election campaign. (Photo by Olivier Douliery-Pool/Getty Images)
WASHINGTON, DC - JUNE 12: (AFP OUT) U.S. Preisdent Donald Trump speaks during a meeting in the Cabinet Room of the White House June 12, 2017 in Washington, DC. Also in attendence was U.S. Attorney General Jeff Sessions who is expected to testify in an open hearing before Senate Intelligence Committee about his contacts with Russian officials during the 2016 election campaign. (Photo by Olivier Douliery-Pool/Getty Images)
A general view of a cabinet meeting with US President Donald Trump(Center L) is seen at the White House in Washington, DC, on June 12, 2017. / AFP PHOTO / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
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About two decades before he blasted anonymous sourcing, Trump was an anonymous source for the National Enquirer, according to the New Yorker.

A senior media official told the New Yorker that when Trump's friend, David Pecker, became a publisher for the Enquirer in 1999, Pecker agreed not to write anything that would damage Trump.

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An employee of the tabloid told the New Yorker that whenever something was happening in New York, Trump would talk to Pecker and even provide him with stories directly.

During Trump's presidential campaign Pecker allowed Trump to write columns under his own byline.

The employee also said that if Trump didn't want a story to run -- it wouldn't.

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