Committee Chairman Rep. Adam Schiff (D-CA) arrives to speak to members of the media after Intelligence Community Inspector General Michael Atkinson met behind closed doors with the House Intelligence Committee at the U.S. Capitol on September 19, 2019 in Washington, DC. Alex Wong/Getty Images

House Intelligence Chairman Adam Schiff told reporters Friday that Congress will get to the bottom of the whistleblower complaint come "hell or high water." He added that the complaint involves "something more sinister" than a policy difference.

Schiff said that the inspector general of the intelligence community determined it was within the purview of the DNI when asked if this had to do with an intelligence matter.

"Whether this involves Ukraine, or some other country, that the other finding that the inspector general had to make was this does not involve a policy difference. Because that doesn’t qualify as an urgent complaint," Schiff said.

"This involves something more sinister, something involving a serious or flagrant abuse or violation of law or misappropriation, and the IG underscored the seriousness of this, and also that this needs to be looked into. And right now, no one is looking into this."

Schiff said that the inspector general of the intelligence community determined it was within the purview of the DNI when asked if this had to do with an intelligence matter.

He added that he has not received an "adequate response" from the Trump administration to the request by his and two other committees for information related to Rudy Giuliani's communications with Ukrainian officials.