"British officials and analysts were surprised at the tough language in the GCHQ response, especially from an agency that traditionally refuses to comment on any intelligence matter.
There was some annoyance and eye rolling as well. Tim Farron, the leader of the Liberal Democrats, the junior partner in the last British coalition government, described Mr. Spicer’s repetition of the claims as “shameful” and said Mr. Trump was “compromising the vital U.K.-U.S. security relationship to try to cover his own embarrassment.”
Dominic Grieve, the current intelligence committee chairman in Parliament, noted that no president can instruct the GCHQ to act. He pointed to elaborate safeguards that prevent spying on the United States and require “a valid national security purpose” for any monitoring. “It is inconceivable that those legal requirements could be met in the circumstances described,” he said in a statement.
But Downing Street clearly wanted to avoid adding to any embarrassment in Washington while making it clear that Britain had no part in any such wiretapping, and that Britain would not be a party to circumventing the laws of a closely allied country. “We have a close relationship which allows us to raise concerns when they arise, as was true in this case,” the prime minister’s spokesman said. “This shows the administration doesn’t give the allegations any credence.”