The agreement comes after White House press secretary Sean Spicer pointed to the debunked claim publicly in a bid to defend Trump's earlier suggestion that former President Barack Obama wiretapped Trump Tower. Trump has not provided any evidence to support that claim, and several lawmakers say there isn't any.
Downing St said that Britain's ambassador to Washington, Kim Darroch, spoke to White House press secretary Sean Spicer directly, and that the prime minister's national security adviser, Mark Lyall Grant, also spoke to people in the Trump administration to put the claim to rest.
In an attempt to bolster his case, Spicer spent nearly 10 minutes reading from news reports which he said pointed to possible evidence of surveillance. Among the items he quoted from was a transcript of a recent appearance by Fox News analyst Andrew Napolitano on the network, in which Napolitano suggested GCHQ, the British electronic intelligence agency, had helped with the alleged tapping. Obama, he claimed, "went outside the chain of command" so there were "no American fingerprints on this."