The lead attorney for the whistleblower responsible for a complaint focused on 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’s dealings with Ukraine warned the president on Monday about retaliating against his client, saying it would be a violation of federal law.

Andrew P. Bakaj issued the warning on Twitter as Trump escalated his attacks against the whistleblower and the credibility of the complaint regarding his interactions with Ukrainian President Volodymyr Zelensky. Trump said earlier Monday that the White House was “trying to find out” the identity of the whistleblower.

"The Intel Community Whistleblower is entitled to anonymity," Bakaj said on Twitter moments later. "Law and policy support this and the individual is not to be retaliated against. Doing so is a violation of federal law."

IC WB UPDATE: The Intel Community Whistleblower is entitled to anonymity. Law and policy support this and the individual is not to be retaliated against. Doing so is a violation of federal law. — Andrew P. Bakaj (@AndrewBakaj) September 30, 2019

The whistleblower complaint, which was released to the public Thursday, accuses Trump and his 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 of a broad effort to enlist Ukraine's help in investigating 2020 presidential candidate 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 over unsubstantiated allegations of corruption.

The whistleblower, whose identity remains unknown, alleged that they received information from several government officials who claimed Trump was "using the power of his office to solicit interference from a foreign government in the 2020 U.S. election."

ADVERTISEMENT

The figure also wrote in the complaint that allegations about a July 25 phone call between Trump and Zelensky were based on accounts from "multiple White House officials with direct knowledge."

The White House last week released a memo confirming that Trump asked Zelensky on the phone call to work with Giuliani and Attorney General William Barr Bill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE to investigate the Bidens.

The revelations prompted 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.) to announce a formal impeachment inquiry into the president.

Trump has repeatedly dismissed allegations of impropriety and has described his July 25 conversation with Zelensky as "perfect." He also has frequently targeted the whistleblower and the officials who provided him with information.

During a private event in New York on Thursday, the president suggested those involved had committed treason.

"That’s close to a spy," he said, according to audio obtained by the Los Angeles Times. "You know what we used to do in the old days when we were smart? Right? The spies and treason, we used to handle it a little differently than we do now."

Trump then tweeted on Sunday that he wanted to meet the whistleblower, claiming that the complaint represented him in a "totally inaccurate and fraudulent way."

"I want to meet not only my accuser, who presented second and third hand information, but also the person who illegally gave this information, which was largely incorrect, to the 'Whistleblower,'" Trump said. "Was this person SPYING on the U.S. President? Big Consequences!"