The House Foreign Affairs Committee on Friday subpoenaed Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE for documents relating to the Trump administration's dealings with Ukraine, indicating Democrats are wasting no time diving into the formal impeachment inquiry they launched this week.

The subpoena notice, drafted in consultation with the Intelligence and Oversight and Reform committees, accuses Pompeo of refusing to turn over requested information to Congress amid the Democrats’ nascent investigation into Trump’s interactions with Ukrainian President Volodymyr Zelensky.

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"Your continued refusal to provide the requested documents not only prevents our Committees from fully investigating these matters, but impairs Congress' ability to fulfill its Constitutional responsibilities to protect our national security and the integrity of our democracy," wrote Reps. Eliot Engel Eliot Lance EngelHouse panel halts contempt proceedings against Pompeo after documents turned over Engel subpoenas US global media chief Michael Pack The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-N.Y.), head of Foreign Affairs; 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.), chairman of the Intelligence panel; and Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.), who leads the Committee on Oversight and Reform.

The subpoena letter explicitly cited the Democrats’ newly launched impeachment inquiry into Trump, suggesting that party leaders will lean heavily on impeachment as a legal justification for obtaining disputed documents. A failure to produce them, they warned Pompeo, would be evidence of obstruction.

They gave a deadline of one week for the documents.

“Pursuant to the House of Representatives’ impeachment inquiry, we are hereby transmitting a subpoena that compels you to produce the documents set forth in the accompanying schedule by October 4, 2019,” the trio of chairmen wrote.

The lawmakers also notified Pompeo in a separate letter that they had scheduled depositions for five State Department officials between Wednesday and Oct. 10.

Those officials are Marie Yovanovitch, the former U.S. ambassador to Ukraine; Kurt Volker, a former NATO ambassador who is Trump’s special representative for Ukraine negotiations; State Department Deputy Assistant Secretary George Kent; State Department counselor T. Ulrich Brechbuhl; and Gordon Sondland, U.S. ambassador to the European Union.

Volker resigned from his role in the Trump administration on Friday. If he appears before Congress, he will do so as a private citizen.

The Democratic lawmakers noted that they had previously asked Pompeo for the documents on Sept. 9 and Sept. 23.

Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) on Tuesday announced that the House would begin a formal investigation inquiry after a whistleblower claimed that Trump withheld aid from Ukraine in a deliberate effort to pressure its president 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, a 2020 candidate, and his son Hunter Biden.

Trump has denied wrongdoing and slammed the complaint as “fake news”, although a memo of Trump’s call with Zelensky released by the White House showed that Trump encouraged the Ukrainian president to look into Biden.

“There's a lot of talk about Biden's son, that Biden stopped the prosecution and a lot of people want to find out about that so whatever you can do with the Attorney General would be great," Trump told Zelensky in the July 25 call.

The Hill has reached out to the State Department for comment.