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 came to the defense of two senior FBI officials on Saturday after President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE targeted the pair on Twitter.

Brennan tweeted that FBI Deputy Director Andrew McCabe and top FBI lawyer James Baker "epitomize integrity, competence, and respect for rule of law."

"Not surprised @realDonaldTrump fears them, along with the rest of FBI," continued Brennan, who served as CIA chief under former President Obama.

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"I just donated to @FBIAgentsAssoc as a small way of saying #thanksFBI," Brennan tweeted, along with a link explaining how to donate to the association.

Andy McCabe & Jim Baker epitomize integrity, competence, and respect for rule of law. Not surprised @realDonaldTrump fears them, along with the rest of FBI. I just donated to @FBIAgentsAssoc as a small way of saying #thanksFBI. Here’s how you can too: https://t.co/eSCrfJxxwx https://t.co/QIzsn6EGYY — John O. Brennan (@JohnBrennan) December 23, 2017

Brennan's tweet came after Trump took took aim at the senior FBI officials earlier Saturday, ratcheting up his feud with leadership of the law enforcement agency.

Trump first jabbed at McCabe after it was reported he would be stepping down from his FBI post in March when he is eligible for full pension benefits. Trump wrote that the No. 2 FBI official is "racing the clock to retire with full benefits."

FBI Deputy Director Andrew McCabe is racing the clock to retire with full benefits. 90 days to go?!!! — Donald J. Trump (@realDonaldTrump) December 23, 2017

The president then seized on reports that Baker was being reassigned, remarking "wow."

News of Baker's reassignment had emerged earlier this week.

Wow, “FBI lawyer James Baker reassigned,” according to @FoxNews. — Donald J. Trump (@realDonaldTrump) December 23, 2017

Brennan, who served in both the Bush and Obama administrations, similarly spoke out against Trump on Thursday, saying the president shows "qualities usually found in narcissistic, vengeful autocrats."

McCabe, meanwhile, spent hours before the House Intelligence Committee earlier this week, testifying on the bureau's handling of the Russia probe.