House Intelligence Committee member Rep. Denny Heck Dennis (Denny) Lynn HeckExclusive: Guccifer 2.0 hacked memos expand on Pennsylvania House races Heck enjoys second political wind Incoming lawmaker feeling a bit overwhelmed MORE (D-Wash.) said Friday that there is no reason for the White House to defy a congressional subpoena for Ukraine-related documents unless President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE is "guilty."

Asked what would happen if the White House doesn't comply with the subpoena, Heck told CNN, "Defiance of this act constitutes obstruction of a legitimate congressional inquiry in pursuit of impeachment, and as a consequence of that we will presume or infer that he is not innocent of whatever it is that we're out to verify with the documentation."

"There is no other reason for him to withhold it, to hide it, unless of course he's guilty," he added, referring to Trump.

.@RepDennyHeck explains the "incredibly damning" evidence facing Trump:

"The call report, the President's own words, in which he said... 'I need you to do us a favor, though,' and that combined with what Ambassador Taylor said about it being crazy to withhold security assistance" pic.twitter.com/Fj90ySt1nC — OutFrontCNN (@OutFrontCNN) October 4, 2019

House Democrats earlier Friday issued a subpoena to the White House requesting documents related to the president's dealings with Ukraine. Committees also sent a request to Vice President Pence for documents as their impeachment probe heats up.

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“We deeply regret that President Trump has put us—and the nation—in this position, but his actions have left us with no choice but to issue this subpoena,” House Intelligence Committee Chairman 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.), Oversight and Reform Committee Chairman 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.) and Foreign Affairs Committee Chairman 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.) wrote to acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE.

In their letter, they also warned that defiance of the subpoena would be used as evidence of obstruction. They have given the White House until Oct. 18 to produce the documents.

The White House said in a statement Friday night that the subpoena "changes nothing – just more document requests, wasted time, and taxpayer dollars that will ultimately show the President did nothing wrong."

"The Do Nothing Democrats can continue with their kangaroo court while the President and his Administration will continue to work on behalf of the American people," White House press secretary Stephanie Grisham Stephanie GrishamIvana Trump on Melania as first lady: 'She's very quiet, and she really doesn't go to too many places' The Hill's 12:30 Report: Trump uses White House as campaign backdrop Coronavirus tests not required for all Melania Trump speech attendees: report MORE added in the statement.

Last week, Democrats launched an impeachment inquiry into Trump's dealings with Ukraine, largely based on a call in which Trump encouraged Ukrainian President Volodymyr Zelensky to "look into" Democratic presidential candidate 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.

Trump has maintained that his actions were proper while blasting criticism from the few GOP figures who have raised concerns about his efforts.