Fox News correspondent John Roberts took aim at President TrumpDonald John TrumpTrump rallies in Nevada amid Supreme Court flurry: 'We're gonna get Brett' Trump: 'Good news' that Obama is campaigning again Trump boosts Heller, hammers 'Wacky Jacky' opponent in Nevada MORE on Friday after the president lashed out at the media during an international press conference. 

In a joint press conference Friday morning with British Prime Minister Theresa May, the president blasted CNN and NBC, lashing out at reporters from both networks.

Trump became unhappy with NBC reporter Kristen Welker after being asked if his criticisms of U.S. allies help Russian President Vladimir Putin. 

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"That’s such dishonest reporting," Trump said in response. "Of course it happens to be NBC, which is possibly worse than CNN." 

Roberts issued a statement following the president's remarks, defending Welker's reporting and calling Trump's comments "unfair."

“I know Kristen Welker of NBC,” Roberts said in the statement. “She is honest as the day is long. For the President to call her dishonest is unfair.”

In the same press conference, Trump also dismissed a question from CNN reporter Jim Acosta, turning instead to give Roberts a question.

“Since you attacked CNN, can I ask you a question?” Acosta said, referencing an earlier barb from the president.  

“CNN is fake news. I don’t take questions from CNN,” Trump responded.

“Let’s go to a real network,” the president added before answering a question from Roberts.

Roberts proceeded to ask the president a question without publicly acknowledging the president’s dismissal of Acosta, a move that prompted criticism from other journalists on social media. 

Roberts had issued a statement defending Welker and his decision to ask a question after being called on by Trump in response to backlash for not supporting Acosta.

In the statement, Roberts said he had proceeded with his question when “it became clear that the president wasn’t going to entertain a question from [Acosta].”

“As did my fellow colleagues in the press corps,” Roberts added.

But Roberts, who used to work at CNN, defended the network in his statement.

“I also used to work at CNN,” Roberts added. “There are some fine journalists who work there and risk their lives to report on stories around the world. To issue a blanket condemnation of the network as ‘fake news’ is also unfair.” 

Trump and Acosta have maintained a tense relationship since Trump took office, with Acosta often taking jabs from the president and his supporters.