President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE ripped CNN, a frequent target of his, early Monday as he arrived to London for his first state visit to the United Kingdom.

Trump tweeted that his "only problem" during the trip was that the primary source of U.S. news in the U.K. was CNN — a network whose coverage he described as "negative" and "so much Fake News."

"Very bad for U.S. Big ratings drop. Why doesn't owner @ATT do something?" Trump asked.

Just arrived in the United Kingdom. The only problem is that @CNN is the primary source of news available from the U.S. After watching it for a short while, I turned it off. All negative & so much Fake News, very bad for U.S. Big ratings drop. Why doesn’t owner @ATT do something? — Donald J. Trump (@realDonaldTrump) June 3, 2019

Trump suggested in a follow-up tweet that if consumers stopped using or subscribing to CNN's parent company, AT&T, it "would be forced to make big changes at CNN."

"It is so unfair with such bad, Fake News!" Trump tweeted.

I believe that if people stoped using or subscribing to @ATT, they would be forced to make big changes at @CNN, which is dying in the ratings anyway. It is so unfair with such bad, Fake News! Why wouldn’t they act. When the World watches @CNN, it gets a false picture of USA. Sad! — Donald J. Trump (@realDonaldTrump) June 3, 2019

Trump also push backed on CNN on Sunday after reports that he called Meghan Markle Meghan MarkleTrump wishes Prince Harry 'luck' with Meghan Markle after Biden endorsement: 'Not a fan' Meghan Markle and Prince Harry call on voters to 'reject hate speech' and 'misinformation' Does Kamala Harris's music matter? MORE, the duchess of Sussex, "nasty."

The president said he never called Markle "nasty" and claimed the story was made up by the "Fake News Media," specifically calling out CNN and The New York Times.

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Trump's initial comments were first reported by The Sun. Trump reportedly told the British tabloid he didn't know Markle was "nasty" when asked what he thought about her comments that he was "divisive" and "misogynistic" during his 2016 presidential campaign.

Markle's husband, Prince Harry, is reportedly set to join Trump for a private lunch during the president's visit.