The deputy director of the National Security Agency (NSA) is calling claims that British intelligence agency GCHQ surveilled Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE during the presidential campaign “arrant nonsense.”

Rick Ledgett in a BBC interview dismissed Fox News legal analyst Andrew Napolitano’s comments last week that sources told him former President Obama used Britain’s GCHQ to spy on Trump.

"Of course they wouldn't do it,” Ledgett said from his office at NSA headquarters at Fort Meade in Maryland. “It would be epically stupid."

Ledgett also said Napolitano’s comments, made on Fox News’s “Fox & Friends,” show "a complete lack of understanding in how the relationship works."

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White House press secretary Sean Spicer repeated Napolitano’s claim last Thursday. According to reports, the White House said it explained to Britain’s ambassador that Spicer was merely referencing the existence of the Fox News report, not endorsing it.

Trump also stressed during a press conference on Friday that the report was Fox’s. He did call Napolitano “a very talented legal mind."

“I didn’t make an opinion on it,” Trump said. “You shouldn’t be talking to me, you should be talking to Fox.”

“Fox News cannot confirm Judge Napolitano’s commentary,” Fox News anchor Shepard Smith said on the air on Friday. “Fox News knows of no evidence of any kind that the now-president of the United States was surveilled at any time in any way.”

GCHQ has also dismissed Napolitano’s claim as “utterly ridiculous.”

Trump earlier this month claimed without providing evidence that Obama had wiretapped his phones in Trump Tower in New York to monitor his campaign’s communications.

“How low has President Obama gone to tapp [sic] my phones during the very sacred election process. This is Nixon/Watergate. Bad (or sick) guy!” Trump tweeted.