Sen. John Kennedy John Neely KennedyMORE (R-La.) said Sunday that 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 could have been "over the line" to pressure Ukraine President Volodymyr Zelensky 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 and his son, but added that it “depends on the circumstances.”

“Here are two possible scenarios: number one, the president asked for an investigation of a political rival, number two, the president asked for an investigation of possible corruption by someone who happens to be a political rival,” Kennedy said on CBS’s “Face the Nation.”

“The latter would be in the national interest, the former would be in the president’s parochial interest, which would be over the line,” he added.

.@SenJohnKennedy on quid pro quo: says @realDonaldTrump either asked for an investigation of a political rival or to investigate corruption in Ukraine. He adds, “the former would be in the president’s parochial interest and would be over the line.” pic.twitter.com/e1l6mxcJGa — Face The Nation (@FaceTheNation) November 10, 2019

Kennedy added that the impeachment inquiry into Trump would likely “come down to the president’s intent, his motive, did he have a culpable state of mind.”

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Pressed by host Margaret Brennan on whether actions he considered “over the line” would also be impeachable, Kennedy responded “yeah, probably.” But he added, “That’s like asking me if I didn’t go fishing Saturday, how many fish will I have caught,” and blasted the inquiry as a “fair and impartial firing squad.”

Kennedy also said that the credibility of White House Ukraine adviser Lt. Col. Alexander Vindman, who testified behind closed doors, also “depends on the circumstances.”

“I can comment on the gentleman’s testimony if you let me hear his live testimony, let me hear his cross-examination, let me judge his credibility, let me judge his body language and also allowing the other party to call their own witnesses,” he told Brennan.

Kennedy added that while he had read some of the transcripts released by the House, “any lawyer in my judgment … knows that a sterile transcript is no substitute for live witnesses.”