FILE - Former CIA Director John Brennan testifies on Capitol Hill in Washington, May 23, 2017, before the House Intelligence Committee Russia Investigation Task Force.

FILE - Former CIA Director John Brennan testifies on Capitol Hill in Washington, May 23, 2017, before the House Intelligence Committee Russia Investigation Task Force.

John Brennan has been subpoenaed to testify before a Florida grand jury in a Justice Department probe into whether former law enforcement and intelligence officials conspired against President Trump.

(Image credit: Pablo Martinez Monsivais)

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