Hope Hicks, former White House communications director, arrived Wednesday morning on Capitol Hill in Washington for a closed-door interview with members of the House of Representatives.

The interview by the Democratic-led House judiciary committee is part of the panel’s investigation of U.S. President Donald Trump and obstruction of justice. Hicks is the first testimony they will hear from someone linked to Trump’s inner circle since the release of special counsel Robert Mueller’s report, as the White House has broadly stonewalled their investigations.

The House committee originally subpoenaed Hicks to give public testimony, but agreed to the private interview after negotiations. A transcript of the session will be released in the days afterward.

It was unclear how much new information Hicks will provide. She already co-operated extensively with Mueller’s probe, and a White House lawyer who will be in the room for the interview is expected to try and block her from answering certain questions.

The early returns were not promising for Democrats, based on a tweet from committee member Ted Lieu of California. Lieu alleged a Justice Department attorney was “objecting to everything that Hope Hicks wants to say.”

“She’s objecting to stuff that’s already in the public record,” said Karen Bass, also from California. “It’s pretty ridiculous.”

Washington Democrat Pramila Jayapal called it “a farce.”

In a letter Tuesday to the committee chair Jerry Nadler, White House counsel Pat Cipollone wrote that Trump had directed Hicks not to answer questions “relating to the time of her service as a senior adviser to the president.”

Cipollone said Hicks, as one of Trump’s former senior advisers, is “absolutely immune” from compelled testimony with respect to her service to the president because of the separation of powers between the executive and legislative branches.

The White House has similarly cited executive privilege with respect to many of the Democrats’ demands, using the president’s power to withhold information to protect the confidentiality of the Oval Office decision-making process.

Democrats say they disagree that Hicks’ answers are covered by such immunity or privilege, especially since she has already co-operated with Mueller.

Hicks is seen with the U.S. president on Jan. 17, 2018. Hicks joined the Trump Organization in 2014, worked on Donald Trump’s presidential campaign and then later joined the administration until leaving in March 2018. (Andrew Lamarque/Reuters)

The committee has also subpoenaed Hicks for documents, but she has only partially complied. She agreed to provide some information from her work on Trump’s campaign, according to the committee, but none from her time at the White House.

Testimony from witnesses such as Hicks is one step in House Speaker Nancy Pelosi’s methodical approach to investigating Trump.

Trump Tower meeting, Comey firing are likely asks

More than 60 lawmakers in her caucus — including almost a dozen on the committee — have called for opening an impeachment inquiry, but she has said she wants committees to investigate first and come to a decision on impeachment later.

While Trump has continued to block their requests, Democrats have made some minor gains in recent weeks with Hicks’ appearance and the Justice Department’s agreeing to make some underlying evidence from Mueller’s report available to committee members.

Hicks was present for many of the key moments reviewed in the Mueller report, and her name is one of the most frequently mentioned in the document. Hicks was a key witness for Mueller, delivering important information to the special counsel’s office about multiple episodes involving the president. That includes the president’s role in the drafting of a misleading and incomplete statement about a 2016 Trump Tower meeting at which Trump’s son, Donald Trump Jr., expected to receive dirt on Democrat Hillary Clinton.

Mueller wrote in his 448-page report released in April that there was not enough evidence to establish a criminal conspiracy between Trump’s 2016 campaign and Russia, but he said he could not exonerate Trump on obstruction of justice. The report examined several situations in which Trump attempted to influence or curtail Mueller’s investigation, including the drafting of that statement.

Democratic aides said they plan on asking Hicks about several of those episodes, including the drafting of the statement, efforts to remove Mueller from the investigation and the firing of FBI Director James Comey. The aides spoke on condition of anonymity to discuss their plans for the closed-door meeting.

Watch as Trump discusses the 2020 U.S. presidential race: 

U.S. President Donald Trump said that if a foreign power offered dirt on his 2020 opponent, he would be open to accepting it and would have no obligation to call in the FBI. 1:27

The aides said that lawmakers plan to ask about her knowledge of hush-money payments orchestrated by former Trump lawyer Michael Cohen to two women who claimed to have had affairs with Trump — the porn actress Stormy Daniels and Playboy Playmate Karen McDougal. Trump has denied the allegations. Cohen is now serving three years in prison partly for campaign violations related to the payments.

The Democrats plan to use some of Hicks’s answers to those questions to inform a committee hearing to review Mueller’s report on Thursday. It’s the second in a series of hearings in which the committee is talking to expert witnesses about the report. The transcript will then be released, possibly as soon as this week, according to the aides.

Other Trump associates frequently mentioned in Mueller’s report have refused to appear before the committee, including former White House Counsel Donald McGahn. McGahn’s former chief of staff, Annie Donaldson, was also subpoenaed for documents and an interview and has declined to provide the documents, like Hicks and McGahn. It is unclear whether Donaldson will show up for a scheduled deposition next week.

Republicans have strongly criticized the investigations and say they are unnecessary after Mueller spent two years reviewing the same material and talking to the same witnesses.

Doug Collins of Georgia, top Republican on the committee, said Hicks’s appearance proves that Trump is not stonewalling Congress. He said they could have probably heard from her sooner if they hadn’t taken “a scorched-earth approach to pursuing information” with subpoenas.