The lawyer who founded Judicial Watch and later Freedom Watch, Larry Klayman, has sent a letter to Rep. Devin Nunes, R-Calif., chairman of the Permanent Select Committee on Intelligence, asking him to look at a whistleblower's evidence of "systematic illegal surveillance on prominent Americans, again including the chief justice of the Supreme Court, other justices, 156 judges, prominent businessmen such as Donald Trump, and even yours truly."

That spying was done, Klayman's letter contends, by the FBI.

It's become a major issue following President Trump's assertion that he and Trump Tower were spied upon by the federal government, and the subsequent denials by intelligence and law-enforcement officials, including FBI Director James Comey, who famously cleared Hillary Clinton on accusations she mishandled classified information as U.S. secretary of state.