Former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE on Friday endorsed Rep. Beto O’Rourke (D) in the Texas Senate race on Friday, saying he has the “integrity, intellect and character” lacking in Congress.

“As a former resident of Texas and a proud UT-Austin alumnus, I believe Beto O’Rourke is the type of individual Texans need in the U.S. Senate to represent their best interests,” Brennan tweeted.

As a former resident of Texas and a proud UT-Austin alumnus, I believe Beto O’Rourke is the type of individual Texans need in the U.S. Senate to represent their best interests. He has the integrity, intellect, and character that is in short supply in Congress. Vote! — John O. Brennan (@JohnBrennan) November 2, 2018

Monday’s endorsement was the first made by the former Obama administration CIA chief and frequent critic of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, who has described himself as nonpartisan.

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Brennan on Tuesday urged his Twitter followers to “vote your conscience” in Tuesday's midterm elections.

He said he would be voting for candidates who “reject inflammatory rhetoric.”

“As the child of an immigrant, I will vote for candidates who believe in America living up to its values & remaining the world’s melting pot,” Brennan tweeted.

As the child of an immigrant, I will vote for candidates who believe in America living up to its values & remaining the world’s melting pot. I will vote for individuals who are honest, have integrity, reject inflammatory rhetoric & want to bring us together. Vote your conscience! — John O. Brennan (@JohnBrennan) October 31, 2018

Brennan’s endorsement came after he and other prominent Democratic officials were sent explosive devices in the mail last month.

He has said that President Trump's rhetoric has only "fueled" the feelings that could lead to violence.

"Unfortunately I think Donald Trump has not helped to encourage the type of civil discourse and public engagement, and his rhetoric too frequently, I think, fuels these feelings and sentiments that now are bleeding over into potentially acts of violence," Brennan said last month at the University of Texas at Austin.

O’Rourke’s race against GOP incumbent Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE has tightened ahead of Tuesday’s vote.

A poll released Thursday showed Cruz with a 3-point lead.

Other polls published in October showed Cruz with anywhere from a 5-point to a 10-point advantage, according to the RealClearPolitics polling index.

Election handicappers at the nonpartisan Cook Political Report rate the race as a "toss-up."

The Hill has reached out to O’Rourke’s campaign for comment.