Pelosi warns of 'new stage of investigation' if Trump administration blocks whistleblower

Speaker Nancy PelosiNancy PelosiTrump praises 'domination' of DC protesters Pelosi, Schumer say treatment of protesters outside White House 'dishonors every value that faith teaches us' Democrats call for Congress to take action following death of George Floyd MORE (D-Calif.) said the complaint over President Trump’s call with a foreign leader “must be addressed immediately” and warned of a "new stage of investigation" if the administration blocks the whistleblower. 

“This violation is about our national security. The Inspector General determined that the matter is ‘urgent’ and therefore we face an emergency that must be addressed immediately,” Pelosi wrote in a letter to members of Congress released Sunday. 

The anonymous complaint, the existence of which was made public last week, reportedly includes allegations that Trump asked Ukrainian leaders to investigate former Vice President Joe BidenJoe BidenPresidents and 'presidents' Biden to blast Trump's church photo op in Philadelphia speech Rudy Giuliani calls on Cuomo to remove Bill de Blasio MORE and his family. No evidence has emerged to suggest Biden acted with his son’s interests in mind with regard to his dealings with Ukraine.

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Trump denies he asked Ukraine to investigate Biden, but the White House has not released the complaint or transcript of the call. 

Members of the House Intelligence Committee on Thursday received a briefing from the intelligence community's inspector general but did not receive information about the complaint's contents. Acting Director of National Intelligence Joseph Maguire has refused to provide the information to the committee.

Trump told reporters Sunday he would consider releasing the transcript of his call with Ukrainian President Volodymyr Zelensky. 

“If the Administration persists in blocking this whistleblower from disclosing to Congress a serious possible breach of constitutional duties by the president, they will be entering a grave new chapter of lawlessness which will take us into a whole new stage of investigation,” Pelosi said. 

Pelosi also called on congressional Republicans “to join us” in asking the acting director of national intelligence to “obey the law as we seek the truth to protect the American people and our Constitution.”

In her letter, Pelosi, who has been cautious of calling for impeachment, fails go as far as some of her fellow Democrats who have said the allegations of Trump using the presidency to bully foreign leaders into digging up information on his political opponents calls for an impeachment inquiry. 

More than half of House Democrats have backed an impeachment inquiry over Trump’s alleged interference in the 2016 election, according to The Hill’s whip list.  

Former special counsel Robert MuellerRobert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s report alleged the Trump campaign welcomed Russian help during the election against his Democratic opponent Hillary ClintonHillary Diane Rodham ClintonSessions accepts 'Fox News Sunday' invitation to debate, Tuberville declines The Memo: Trump lags in polls as crises press Biden savors Trump's latest attacks MORE

House Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffFlynn urged Russian diplomat to have 'reciprocal' response to Obama sanctions, new transcripts show The Hill's Morning Report - Presented by Facebook - George Floyd's death sparks protests, National Guard activation Hillicon Valley: Trump signs order targeting social media legal protections | House requests conference with Senate after FISA vote canceled | Minneapolis systems temporarily brought down by hackers MORE (D-Calif.) has been similarly cautious to back impeachment, but said Sunday that if allegations over Trump reaching out to Ukraine are true, impeachment “may be the only remedy.”

--This report was last updated on Sept. 23 at 5:30 a.m.