Britain has been assured that President Trump will not repeat accusations that Britain's GCHQ intelligence agency helped former President Obama surveil Trump Tower, according to reports Friday.

White House press secretary Sean Spicer on Thursday accused GCHQ of helping Obama wiretap Trump during the campaign, citing a claim made by a Fox News analyst earlier this week.

The White House said it explained to Britain’s U.S. ambassador that Spicer was merely referencing the existence of the Fox News report, not endorsing it.

British Prime Minister Theresa May's spokesman said the claim should be ignored.

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"We've made clear to the administration that these claims are ridiculous and they should be ignored and we've received assurances that these allegations will not be repeated," the spokesman told reporters.

"We have a close special relationship with the White House and that allows us to raise concerns as and when they arise as was true in this case."

A GCHQ spokesman also dismissed the accusation, calling it “utterly ridiculous.”

- Updated at 11:23 a.m.