House Speaker Nancy Pelosi on Sunday assailed the Trump administration's efforts to block a whistleblower complaint involving President Donald Trump's apparent effort to have Ukraine investigate former Vice President Joe Biden and his family.

In a letter to colleagues, Pelosi said the administration "will be entering a grave new chapter of lawlessness which will take us into a whole new stage of investigation" if acting Director of National Intelligence Joseph Maguire fails to provide the complaint when he testifies in front of the House Intelligence Committee on Thursday. The complaint reportedly centers around Trump's July conversation with Ukrainian President Volodymyr Zelensky during which Trump is accused of pressuring Zelensky to investigate Biden's son Hunter's role at a Ukrainian energy company.

Pelosi's letter comes as frustration is increasing among lawmakers. They are frustrated not only with what they see as the president's obstruction of the congressional investigation but also with the slow-moving probe into him, lawmakers and aides say.

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30 PHOTOS Nancy Pelosi through the years See Gallery Nancy Pelosi through the years WASHINGTON, DC - MAY 8: File photo dated 08 May, 1996 shows US Congresswoman Nancy Pelosi, D-CA, speaking during a Capitol Hill press conference in Washington, DC. House Democratic leader Dick Gephardt (R, D-MO) is expected to announce 07 November, 2002 that he will not seek another term after the Republican opponents took both the House of Representatives and the Senate in mid-term elections 05 November. One of two Democrats vying to fill the spot is is Minority Whip Nancy Pelosi; the other is chairman of the Democratic caucus Martin Frost (D, TX). (Photo credit should read J. DAVID AKE/AFP/Getty Images) WASHINGTON, DC - MAY 20: US President Bill Clinton signs the Ryan White Comprehensive AIDS Resources Emergency Act Amendments of 1996 20 May at the White House in Washington DC. Standing behind Clinton are (L-R) Jeanne White, mother of Ryan, White House Aide Patsy Fleming, Sen. Bill Frist (R-TN), Rep. Henry Waxman(D-CA), Rep. Nancy Pelosi(D-CA). (Photo credit should read CHUCK KENNEDY/AFP/Getty Images) UNITED STATES - JUNE 25: HOUSE APPROPRIATIONS: Ranking member Nancy Pelosi ,D-Calif., during the House Appropriations,Foreign Operations subcommittee markup of FY 98 foreign operations appropriations. (Photo by Douglas Graham/Congressional Quarterly/Getty Images) SLUG:NA/BAILOUT DATE:9/26/08 WASHINGTON, DC CREDIT: DOMINIC BRACCO II From left, House Speaker Nancy Pelosi (D-CA), and House Financial Services Committee Chairman Barney Frank (D-MA) speak during a press conference about legislation for a bailout of the financial crisis on Capitol Hill on Sept. 26, 2008. (Photo by Dominic Bracco Ii/The Washington Post/Getty Images) Washington, UNITED STATES: US President George W. Bush is applauded by Speaker of the House Nancy Pelosi (R) and Vice President Dick Cheney (L) as he delivers the State of the Union address to a joint session of Congress at the Capitol in Washington 23 January 2007. AFP PHOTO/Larry Downing/Pool (Photo credit should read LARRY DOWNING/AFP/Getty Images) UNITED STATES - OCTOBER 10: WHIP RACE--Nancy Pelosi, D-Calif., left, victor in the Democratic Whip race, talks to reporters and celebrates with supporting members after the Democratic caucus elected her to replace outgoing Whip David E. Bonior, D-Mich., who is running for governor of Michigan. (Photo by Scott J. Ferrell/Congressional Quarterly/Getty Images) WASHINGTON, : Rep. Nancy Pelosi (D-CA,L) newly elected Democratic Minority Leader raises her hand with outgoing leader Dick Gephardt (D-MO) 14 November, 2002 on Capitol Hill in Washington, DC. Pelosi's election marks the first time in the history of the US Congress that a woman will lead her party. 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(Photo by Chip Somodevilla/Getty Images) WASHINGTON, DC - NOVEMBER 14: House Minority Leader Rep. Nancy Pelosi (D-CA) speaks to the media as female House Democrats gather around during a news conference at the U.S. Capitol, on November 14, 2012 in Washington, DC. Leader Pelosi said that she has decided continue to lead the House Democrats and does not wish to retire at this time. (Photo by Mark Wilson/Getty Images) U.S. House Minority Leader Nancy Pelosi, a Democrat from California, bottom center, stands for a photograph with Democratic women of the House on the steps of the U.S. Capitol Building in Washington, D.C., U.S., on Wednesday, Jan. 7, 2015. 65 House Democratic women are part of the 114th Congress, the largest number of women in a party Caucus in the history of the Congress of the United States. Photographer: Andrew Harrer/Bloomberg via Getty Images LOS ANGELES, CA - FEBRUARY 07: (L-R) Former Vice President of the United States Al Gore, Apple's SVP of Internet Software and Services, Eddy Cue, CEO of Apple Tim Cook, music producer Jimmy Iovine and Minority Leader of the United States House of Representatives, Nancy Pelosi attend the Pre-GRAMMY Gala and Salute to Industry Icons honoring Martin Bandier at The Beverly Hilton Hotel on February 7, 2015 in Los Angeles, California. (Photo by Lester Cohen/WireImage) UNITED STATES - JULY 15: Vice President Joe Biden and House Minority Leader Nancy Pelosi, D-Calif., leave a meeting with House Democrats in the Capitol Visitor Center where Biden briefed members on the nuclear deal with Iran, July 15, 2015. 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(Photo by Melina Mara/The Washington Post via Getty Images) Democratic presidential candidate Hillary Clinton (L) walks with House Minority Leader Nancy Pelosi after attending a meeting with the House Democratic Caucus on June 22, 2016 at the US Capitol in Washington, DC. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images) UNITED STATES - JULY 28: House Democratic Leader Nancy Pelosi speaks at the Democratic National Convention in Philadelphia on Thursday, July 28, 2016. (Photo By Bill Clark/CQ Roll Call) WASHINGTON, DC - SEPTEMBER 14: House Minority Leader Nancy Pelosi (D-CA), chats with House Speaker Paul Ryan (R-WI), during a memorial service to honor the late Rep. Mark Takai (D-HI), 49, who died from pancreatic cancer last July, at the US Capitol September 14, 2016 in Washington, DC. (Photo by Mark Wilson/Getty Images) WASHINGTON, DC - SEPTEMBER 21: (L-R) Senate Majority Leader Mitch McConnell (R-KY), Sen. 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Frustration escalated after former Trump aide Corey Lewandowski's day of mostly stonewalling. On Friday, during a meeting of Judiciary Committee Democrats, two Democratic aides said committee leadership tried to calm members who were angry that the panel didn't hold him in contempt on the spot during the hearing.

As the New York Times and others reported, Trump's phone call led to a whistleblower complaint which is now at the center of a standoff between Congress and the administration. The administration has refused to turn over to Congress details of the complaint, though The Washington Post has reported that the allegation centers on a "promise" Trump made.

House Intelligence Committee Chairman Adam Schiff, D-Calif., questioned Sunday that, if Trump's conversation involved no wrongdoing, "why doesn't the president simply release the transcript of that call?"

"And I don't know whether the whistleblower complaint is on this allegation but if it is and even if it isn't, why doesn't the president just say 'release the whistleblower complaint?'" Schiff told CNN's "State of the Union." "Clearly, he's afraid for the public to see either one of those things and we're determined to make sure the public does, the nation is protected."

Administration officials said Sunday that such transcripts are not released so that foreign leaders and the president can discuss matters candidly, but Schiff said there should be no privilege afforded to discussions that "involve potential corruption or criminality."

"This would be the most profound violation of the presidential oath of office certainly during this presidency, which says a lot, but perhaps just about during any presidency," Schiff said. "There is no privilege that covers corruption. No privilege to engage in underhanded discussions."

Schiff added that the "only remedy" to such behavior is impeachment.

Former Secretary of State John Kerry, speaking with CBS's "Face the Nation," called the push for Ukraine to probe Biden a "fundamental, profound and deeply concerning abuse of power," adding it was "unprecedented" and that the transcript should be released to show whether Trump "colluded" with a foreign government to influence the upcoming presidential election.

On NBC's "Meet the Press," Sen. Chris Murphy, D-Conn., said that if the president "is asking another foreign leader to interfere in an American election," then "there has to be consequences."

Murphy, a member of the Senate Foreign Relations Committee, recently met with Zelensky in Kiev. He said the Ukrainian president "didn’t understand whether this was an official government position, these requests to investigate the former vice president."

Some Republicans also expressed concern about the phone call. Sen. Pat Toomey, R-Pa., told "Meet The Press" that while he didn't "know the context" of the phone call between Trump and Zelensky or "what was said," "it is not appropriate for any candidate" to "ask for assistance from a foreign government."

Sen. Mitt Romney, R-Utah, said in a Sunday tweet that if Trump "asked or pressured Ukraine’s president to investigate his political rival, either directly or through his personal attorney, it would be troubling in the extreme."

"Critical for the facts to come out," he said.

Meanwhile, Trump and his allies sought to deny any wrongdoing by the president. Responding to Romney in a text message to NBC News, the president's personal attorney, Rudy Giuliani, said Romney is "still trying to figure out what happened to him when that Candy lady whacked him around in the debate with" then-President Barack Obama, referencing a moment from a 2012 presidential debate moderated by former CNN anchor Candy Crowley.

Giuliani said the Ukrainian efforts were simply "what presidents do who care about the selling of public office."

And on the Sunday show circuit, Treasury Secretary Steven Mnuchin told "State of the Union" that he would not "speculate" on what Trump discussed with Zelensky, though he said he didn't "expect there were any issues whatsoever."

Mnuchin told host Jake Tapper: "I don't have any reason to believe that the president pressured," adding later "there is really no issue here." Releasing the transcript of that phone call "would be a terrible precedent," he said.

Secretary of State Mike Pompeo said on ABC's "This Week" that if Biden "behaved inappropriately, if he was protecting his son and intervened with the Ukrainian leadership in a way that was corrupt, I do think we need to get to the bottom of that." He said he'd allow the White House to explain why they have not released the transcript of the phone call, calling it "rare" that such a transcript would be released.

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Joe Biden (D-DE) and New Mexico Gov. Bill Richardson greet the crowd before the start of the first debate of the 2008 presidential campaign April 26, 2007 at South Carolina State University in Orangeburg, South Carolina. The debate, featuring eight Democratic presidential candidates, comes 263 days before the first ballot will be cast in the Iowa caucus next January. (Photo by Justin Sullivan/Getty Images) WASHINGTON, DC - JANUARY 23: U.S. Vice President Joe Biden (C) talks with mayors from across the country, including Milwaukee Mayor Tom Barrett, in the Roosevelt Room of teh White January 23, 2014 in Washington, DC. The U.S. Conference of Mayors is holding its annual conference in Washington this week. (Photo by Chip Somodevilla/Getty Images) US Vice President Joe Biden speaks during the Civil Society Forum on the sideline of the US-Africa Leaders Summit in Washington, DC, on August 4, 2014. 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Trump told reporters Sunday that he did discuss Biden with Zelensky but said there was "absolutely nothing wrong" with the call. He told reporters later Sunday that he might provide a transcript of the conversation to a "respected source."

"The conversation I had was largely congratulatory, with largely corruption, all of the corruption taking place and largely the fact that we don't want our people like Vice President Biden and his son creating the corruption already in the Ukraine and Ukraine has got a lot of problems," Trump said. "The new president is saying that he's going to be able to rid the country of corruption, and I said that would be a great thing, we had a great conversation."

The president also said there was "no quid pro quo, there was nothing," and, "It was a perfect conversation."

In a campaign memo sent Sunday afternoon, Biden's deputy campaign manager Kate Bedingfield wrote that the Ukraine episode showed "Trump and his campaign are terrified of facing Vice President Biden in a general election."

"The president and his lackeys are so terrified of that prospect — and have abandoned any pretense of having an iota of truth on their side as they flail and try to distract from what may be the greatest presidential malfeasance since Watergate — that they fell all over themselves lying on the Sunday shows today," she added.

The president's focus on Biden and Ukraine comes amid Giuliani's monthslong effort to get Ukraine to further investigate the former vice president, an effort which was aided by the State Department, as NBC News reported last month. The push centers on Biden's 2016 call — widely backed by the international community — for Ukraine to crack down on corruption, including removing a Ukrainian prosecutor, Viktor Shokin, who was seen as ineffective and was later removed by the country's parliament. One of the cases that Shokin was investigating involved Burisma Holdings, a natural gas company whose board at the time included Biden's son.

Earlier this year, Bloomberg News, citing documents and an interview with a former Ukrainian official, reported the Burisma investigation had been dormant for more than a year by the time Biden called for the crackdown on corruption. The then-Ukrainian prosecutor general told the news agency he found no evidence of wrongdoing by Biden and his son. PolitiFact, meanwhile, reported that it found no evidence to "support the idea that Joe Biden advocated with his son's interests in mind."

House Democrats have already announced an investigation into Giuliani's Ukrainian efforts. On Wednesday, Trump is set to meet face to face with Zelensky on the sidelines of the United Nations General Assembly in New York. In the weeks before the whistleblower complaint became public, the Trump administration froze $250 million in military aid to Ukraine for unclear reasons. Then, just before Democrats revealed the existence of the whistleblower complaint, the administration released the hold on the Ukrainian military aid.

On Saturday, Ukrainian Foreign Minister Vadym Prystaiko said he didn't think Trump pressured Zelensky, a former comedian, during their July phone call.

"I know what the conversation was about, and I think there was no pressure," he said. "There was talk, conversations are different, leaders have the right to discuss any problems that exist. This conversation was long, friendly, and it touched on a lot of questions, including those requiring serious answers."

Speaking to reporters in Iowa on Saturday, Biden said "Trump's doing this because he knows I'll beat him like a drum and he's using the abuse of power and every element of the presidency to try to do something to smear me."

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