Brennan responds to Trump tweet with advice for diplomats, intelligence agents and 'other courageous patriots'

Former CIA chief John BrennanJohn Owen BrennanOvernight Defense & National Security — US, Israeli defense chiefs discuss Iran US ends combat mission against ISIS in Iraq, but troops remain This Thanksgiving, skip the political food fights and talk UFOs instead MORE fired back on Tuesday after President TrumpDonald TrumpWendy Sherman takes leading role as Biden's 'hard-nosed' Russia negotiator Senate needs to confirm Deborah Lipstadt as antisemitism envoy — Now Former acting Defense secretary under Trump met with Jan. 6 committee: report MORE questioned why witnesses in the House's impeachment inquiry would have been "concerned" with his phone call with Ukraine's president.

In a tweet, Brennan urged U.S. intelligence officials to remain "resolute" in the face of criticism from the president, who has spent the past several days sharply criticizing a whistleblower and others who raised concerns about his conversations with Ukraine's Volodymyr Zelensky about opening investigations targeting Democrats.

"As in previous times of National peril, we rely on our military, diplomats, intelligence officials, law enforcement officers, & other courageous patriots to protect our liberties, freedom, & democracy. May they stay resolute & strong despite corrupt political headwinds they face," Brennan tweeted.

Brennan's tweet came in response to a tweet from the president earlier in the day in which Trump questioned whether Lt. Col. Alexander Vindman had been "on the same call that I was," and described Vindman as a "Never Trumper," referring to Republicans who vowed to oppose his election in 2016.

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"Supposedly, according to the Corrupt Media, the Ukraine call 'concerned' today’s Never Trumper witness. Was he on the same call that I was? Can’t be possible! Please ask him to read the Transcript of the call. Witch Hunt!" Trump tweeted.

The tweet was Trump's latest attack on House Democrats' impeachment inquiry, which Trump and his GOP allies have characterized as a partisan attempt to overturn the 2016 election. Democrats have argued that the probe is focused on Trump's attempts to persuade Ukraine's president to investigate former Vice President Joe BidenJoe BidenCarville advises Democrats to 'quit being a whiny party' Wendy Sherman takes leading role as Biden's 'hard-nosed' Russia negotiator Sullivan: 'It's too soon to tell' if Texas synagogue hostage situation part of broader extremist threat MORE, currently a front-runner in the Democratic 2020 primary, and allegations that Trump attempted to withhold military aid over the issue.

Lawmakers are set to vote later this week on the impeachment inquiry for the first time, which Democrats hope will strengthen the House's claims that the investigation is a legitimate probe into the president's alleged wrongdoing.