Top Judiciary Republican: 'My first and foremost witness is Adam Schiff'

Rep. Doug CollinsDouglas (Doug) Allen CollinsHouse Freedom Caucus chairman endorses Collins's Georgia Senate bid The Hill's Morning Report - Sanders steamrolls to South Carolina primary, Super Tuesday Congress set for clash over surveillance reforms MORE (Ga.), the top GOP member of the House Judiciary Committee, said Sunday that Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffThe Hill's Morning Report - Sanders steamrolls to South Carolina primary, Super Tuesday Schiff blasts Trump for making 'false claims' about Russia intel: 'You've betrayed America. Again' Trump: Nevada a 'great win' for Sanders 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 WallaceChristopher (Chris) WallacePresident Trump's assault on checks and balances: Five acts in four weeks Steyer: 'I do for sure' have to finish in top three in South Carolina Pence chief of staff: 'There's not intelligence' saying Russia wants Trump reelected MORE questioned Collins about testimony from several House Intelligence Committee witnesses who said President TrumpDonald John TrumpAdvisor: Sanders could beat Trump in Texas Bloomberg rips Sanders over Castro comments What coronavirus teaches us for preventing the next big bio threat MORE had conditioned aid to Ukraine on investigations into former Vice President Joe BidenJoe BidenBiden faces do-or-die primary in South Carolina Democrats view Sanders as having best shot to defeat Trump: poll Karl Rove: 'Long way to go' for Sanders to capture nomination: 'The field is splintered' 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.”