The letter argues for the validity of the investigation, claiming that the request is for confidential communication "which is potentially protected by executive privilege and would require careful scrutiny."
Burnison concludes by saying that the department "remains committed to working with Congress."
The outgoing Energy Secretary Rick Perry's role in the Ukraine scandal has been examined in recent weeks, and his contact with Ukrainian officials was the subject of the meeting from husdemokraterna.
Acting Chief of Staff at the White House Mick Mulvaney confirmed at a rare press conference Thursday that President Donald Trump had instructed Perry, at a May 23 meeting at the Oval Office, to work through his personal lawyer Rudy Giuliani on Ukraine-related issues.
Several witnesses in the impeachment probe have testified that Giuliani interfered in foreign policy related to Ukraine, bypassing the diplomatic process in some cases.
House Democrats had also sought documents related to Perry's trip to Ukraine for President Volodymyr Zelensky's inauguration, when Perry led the US delegation instead of Vice President Mike Pence on Trump's instruction.
The rejection is the latest instance where the Trump administration has rejected the sentiment of the vote in the Democratic Violence Survey.
In a letter to Speaker Nancy Pelosi last week, the White House charged that its investigation into violence was "illegal" and "unconstitutional," and that it would not participate in the investigation.
The State Department, the Pentagon, and the Office of Management and Budget have all failed to respond to Parliament's deadlines after Democrats demanded a plethora of documents related to the freezing of US security assistance to Ukraine, the impetus for Ukraine to launch an investigation and equip former US Ambassador to Ukraine Marie Yovanovitch.
"The Department cannot currently comply with your request for documents," Robert Hood, Deputy Secretary of Defense for Legislative Affairs, wrote to the three committees that led the impeachment probe on Tuesday. "The department understands the importance of your information request and has taken steps to identify, preserve and collect potentially responsive documents."
Democrats have been more successful in suing to get current and past administrative officials, despite the White House's leadership not showing up. This past week, all former Russia advisers Fiona Hill, Deputy Secretary of State George Kent and US Ambassador to the European Union, testified at Gordon Sondland.
But the Trump administration's stonewalling of the inquiry has hampered the Democratic inquiry in one important way: these officials did not provide documents to the committee, saying they had the Trump administration.
"We know from the additional witnesses who have stated that there are additional documents that they have provided to the State Department but have not been given to Congress," House Intelligence President Adam Schiff, a California Democrat, said this week.
While Democrats have been sued in other investigations for trying to get the documents the Trump administration has refused to disclose, this time they signal that they will go a different route: that despite the lawsuits is evidence of obstacles to Congress.
"In spite of lawsuits, we will consider evidence of the president's effort to impede the impeachment investigation, and we may also use that obstacle as further evidence of the fallacy of the president's underlying misunderstanding," Schiff wrote in a letter to colleagues this week.
Republicans have defended the Trump administration's decision not to cooperate with the investigation, arguing that Schiff does not conduct a fair investigation.
"I think the conference (Republican House) is completely united in the idea that we stand behind the president as the American people do," said Ohio Rep. Jim Jordan, the highest Republican member of the House Monitoring Committee. "This investigation, as I just said before, is unfair and partial, and we see it for what it is."
More lawsuits are likely to be sent from Capitol Hill to the Executive Branch as the impeachment probe marches and more witnesses are interviewed. Despite the Trump administration's rejection of document votes, it remains to be seen whether the top officials the Democrats are likely to receive testimony from ̵
This story has been updated.