Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) said Thursday that special counsel Robert Mueller has likely concluded there is no obstruction of justice case against President Trump because he would not allow FBI Director James Comey to publicly testify if there were one.

“Unless Mueller is a complete idiot, which he is not, he’s concluded there’s no obstruction of justice case because if he had concluded otherwise, Comey wouldn’t be testifying,” Graham said on “CBS This Morning.”

“You wouldn’t let his chief and only witness go through this process if you believe you really had a case to prosecute. And Mr. Mueller is a good prosecutor,” the Republican senator added.

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Rep. Adam Schiff Adam Bennett SchiffSchiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power Rubio on peaceful transfer of power: 'We will have a legitimate & fair election' MORE (D-Calif.), ranking member of the House Intelligence Committee, directly disagreed with Graham on Thursday, saying Mueller, who is tasked with investigating Russian interference in the presidential election, most likely has not formed an opinion so “early in the investigation.”

“I would have to strongly disagree with my colleague Lindsey Graham. The fact that Bob Mueller is not worried about his testifying — I think that does not suggest anything about how Bob Mueller views the case,” Schiff also said on “CBS This Morning.” “Indeed, I would be astonished if he had a view this early in the investigation. Rather, I think it shows confidence that Jim Comey will be consistent in his testimony before the Senate and in any later proceeding. But I wouldn’t read any conclusion into that, one way or another.”

Graham in response called Schiff’s analysis “crazy.”

“Nobody in their right mind who believed they had a case, would take their star witness and allow them to go before the nation and 20 senators,” Graham argued. “You just don’t do it that way. So he’s concluded, rightly, there’s no obstruction of justice here. To think otherwise really is silly.”

Comey will testify before the Senate Intelligence Committee on Thursday. In his opening statement, he said that Trump asked him to pledge his loyalty and to "let go" of his investigation into former national security adviser Michael Flynn.

Trump fired Comey amid his agency's ongoing investigation into whether the Trump campaign colluded with Russia during the 2016 presidential election.