Attorneys representing the whistleblower at the center of the Ukraine controversy surrounding 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 say negotiations over whether the individual will testify on Capitol Hill remain ongoing.

“We continue to work with both parties in the House and Senate and we understand and agree that protecting the whistleblower’s identity is paramount,” the Compass Rose Legal Group said in a statement late Sunday.

“While discussions continue to occur to coordinate and finalize logistics, no date/time has yet been set,” they added.

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The statement came hours after Rep. 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.), the chairman of the House Intelligence Committee, said that an agreement had been reached for the whistleblower to testify before Congress.

During an appearance on NBC's "Meet the Press,” the California Democrat said that “all that needs to be done, at this point, is to make sure that the attorneys that represent the whistleblower get the clearances that they need to be able to accompany the whistleblower to testimony.”

Schiff's committee last week released the whistleblower's complaint, which alleges that Trump “sought to pressure” Ukrainian President Volodymyr Zelensky “to take actions to help the President’s 2020 reelection bid” during a July 25 phone call.

The whistleblower, whose identity has not been released, went on to allege that multiple government officials said the president was "using the power of his office to solicit interference from a foreign government in the 2020 U.S. election” when he allegedly pressed Zelensky to investigate 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, who is a Democratic presidential contender.

"The President's personal lawyer, 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, is a central figure in this effort. Attorney General [William] Barr also appears to be involved as well," the complaint also stated.

House Democrats launched a formal impeachment inquiry against the president last week amid the revelations.

When pressed on Sunday about the idea of having Giuliani testify before Congress over the complaint, Schiff said, “I don't want to commit myself to that at this point.”

"We certainly have to do a lot of work to see what Giuliani has been doing in Ukraine,” he said, adding, "Whether it will be productive to bring him in, we will make that decision down the road."

Giuliani said during a separate interview that he would testify if Trump directs him to.