Former CIA chief and vocal Trump critic 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 said Thursday he believes the person who filed a whistleblower complaint against President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE "deserves our praise and gratitude."

“Democrats & Republicans (those who have a conscience) need to work together to prevent desperate moves by Trump that could wreak further havoc,” Brennan tweeted.

Whistleblower deserves our praise & gratitude.



Donald Trump getting very sloppy & careless in corrupt practices & cover up attempts.



Democrats & Republicans (those who have a conscience) need to work together to prevent desperate moves by Trump that could wreak further havoc. — John O. Brennan (@JohnBrennan) September 26, 2019

The nine-page whistleblower complaint was shared with the public by the House Intelligence Committee earlier Thursday. It raises allegations about the July 25 call between Trump and Ukrainian President Volodymyr Zelensky, in which the leaders discussed former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his son, Hunter Biden.

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The complaint also accuses the Trump administration of “efforts to restrict access to records related to the call,” in addition to accusations surrounding Trump’s personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE's meetings with Ukrainian officials.

The allegations are the subject of the formal impeachment inquiry against Trump launched by House Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) Tuesday.

Democratic lawmakers have slammed the president over the last week over the allegations, and some GOP lawmakers have also announced their alarm over the complaint, including Sen. Ben Sasse Benjamin (Ben) Eric SasseWhy a backdoor to encrypted data is detrimental to cybersecurity and data integrity McEnany says Trump will accept result of 'free and fair election' McConnell pushes back on Trump: 'There will be an orderly transition' MORE (Neb.) and Reps. Elise Stefanik Elise Marie StefanikRepublicans cast Trump as best choice for women The Hill's Morning Report - Presented by Facebook - Pence rips Biden as radical risk GOP women offer personal testimonials on Trump MORE (N.Y.) and Will Hurd William Ballard HurdHillicon Valley: Oracle confirms deal with TikTok to be 'trusted technology provider' | QAnon spreads across globe, shadowing COVID-19 | VA hit by data breach impacting 46,000 veterans House approves bill to secure internet-connected federal devices against cyber threats House Democrats' campaign arm reserves .6M in ads in competitive districts MORE (Texas).

Trump has spoken out multiple times about the allegations over the last week. He tweeted Thursday attacking House Intelligence Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.).

Liddle’ Adam Schiff, who has worked unsuccessfully for 3 years to hurt the Republican Party and President, has just said that the Whistleblower, even though he or she only had second hand information, “is credible.” How can that be with zero info and a known bias. Democrat Scam! — Donald J. Trump (@realDonaldTrump) September 26, 2019

This is not the first time Brennan has spoken out to criticize Trump. After the president criticized top intelligence leaders earlier this year, Brennan said the move showed “the extent of [Trump’s] intellectual bankruptcy."

Last year, Brennan called Trump’s decision to pull U.S. troops from Syria an example of his “impulsive and self-satisfying ‘gut.’”