Rep. Doug Collins Douglas (Doug) Allen CollinsDemocrats ramp up pressure on Lieberman to drop out of Georgia Senate race The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements GOP, Democrats look to galvanize women with SCOTUS fight MORE (Ga.), the top GOP member of the House Judiciary Committee, said Sunday that 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.) is the most important witness Republicans want to question in the upcoming phase of the impeachment inquiry.

“My first and foremost witness is Adam Schiff,” Collins said on “Fox News Sunday,” also noting that Schiff had “compared himself in the past to a special counsel” and that then-special prosecutor Ken Starr testified during the GOP-controlled House’s impeachment of former President Clinton.

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"[Schiff] has put himself into that position," Collins added. "If he chooses not to [testify], then I really have to question his veracity in what he’s putting in his report."

"It’s easy to hide behind a report," Collins said. "But it’s going to be another thing to actually get up and have to answer questions."

Host Chris Wallace Christopher (Chris) WallaceHouse to vote on resolution affirming peaceful transition of power Gayle King calls out Pelosi for calling Trump supporters 'henchmen': 'Egregious language' GOP lawmakers distance themselves from Trump comments on transfer of power MORE questioned Collins about testimony from several House Intelligence Committee witnesses who said 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 had conditioned aid to Ukraine on investigations into 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’s son Hunter Biden and conspiracy theories about Ukrainian interference in the 2016 election.

“Before we get to the question of whether this is an impeachable offense or not, simply, do you see anything wrong with that? The president conditioning support for Ukraine — whether it was a meeting with Zelensky, whether it's military aid — conditioning support for Ukraine to that country investigating some of the president's political rivals?” Wallace asked.

“The premise of your question is based on witnesses who agree with your premise,” Collins responded, saying that he himself did not agree.

Wallace continued to press Collins, asking whether aid being conditioned on an investigation of the Bidens would be an impeachable offense.

“I do not believe it, so I’m not going to answer a hypothetical which is designed to simply say that the president did something improper,” Collins replied, adding that “he did nothing improper.”