A GCHQ spokesman made the comments Wednesday after President Trump tweeted that a former CIA analyst, Larry Johnson, had made the allegation against London, Presstv Reported.
“As we have previously stated, the allegations that GCHQ was asked to conduct 'wire tapping' against the then President Elect are nonsense. They are utterly ridiculous and should be ignored," Reuters quoted the spokesman as saying.
Trump himself sounded alarming on Twitter, referencing an indefinite time of “beauty” when the allegations are allegedly confirmed.
"It is now just a question of time before the truth comes out, and when it does, it will be a beauty!"
The Buckingham Palace had confirmed hours earlier that President Trump would visit the UK in June.
After his working visit last year, Trump is scheduled to visit the UK from June 3-5 for an official state visit as a guest of Queen Elizabeth II.
The right wing news channel One America News Network, which Trump quoted, is apparently known for reporting false stories and fake news.
Johnson, who left the CIA more than 26 years ago, was previously known for spreading a hoax in 2008 that Michelle Obama had used a slur against white Americans.