Sen.(R-Texas), a member of the Senate Intelligence Committee, said Thursday that he would raise the subpoena ofwith Chairman(R-N.C.), warning the the panel needs to stay out of politics.

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Cornyn, speaking to reporters outside of the Judiciary Committee, said that he could "understand [Trump Jr.'s] frustration" and warned that 'at some point … this smacks of politics."

"At some point this is not about finding facts, this smacks of politics and I think we have an important job to do to try to keep the Intelligence Committee out of politics and just keep ourselves focused on our mission, which is oversight of the Intelligence Community," said Cornyn, who is an advisor to Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.).

Pressed if he was saying he thought Burr's actions were "more about politics and not about following up on leads," Cornyn added that he "didn't say that."

"I think the committee’s been doing important work that’s been done on a bipartisan basis, and it really is about finding out what the facts are and what we need to do to prevent foreign interference in the future. I can understand Mr. Trump’s frustration now that the Mueller report has gone public and finding no evidence of collusion. I can understand his frustration at being requested to come back," Cornyn continued.

Cornyn: My understanding is @DonaldJTrumpJr has cooperated extensively with the committee, I can understand his frustration...At some pt this is not about finding facts. This smacks of politics and I think we have an impt job to do to try to keep the intel cmte out of politics. pic.twitter.com/WRasaDYzes — Alan He (@alanhe) May 9, 2019

Reports surfaced on Wednesday that the GOP-led Senate Intelligence Committee had subpoenaed Trump Jr. in connection with the panel’s Russia investigation, the first known congressional subpoena to one of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s children.

Trump Jr. previously testified before the Senate Judiciary Committee in 2017. But his comments have fallen under scrutiny after the president’s former personal attorney Michael Cohen Michael Dean CohenJudge orders Eric Trump to comply with New York AG's subpoena before Election Day A huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr MORE claimed in his February testimony to the House Oversight and Reform Committee that Trump Jr. was far more involved in the Moscow Trump Tower project and that he briefed both Trump Jr. and Ivanka Trump Ivana (Ivanka) Marie TrumpSpecial counsel investigating DeVos for potential Hatch Act violation: report Trump, Biden vie for Minnesota Trump luxury properties have charged US government .1M since inauguration: report MORE on the project about 10 times.

The decision to subpoena Trump Jr. has sparked GOP criticism of Burr, who as chairman has been leading the committee's investigation. The panel has been running a years-long investigation into the 2016 election and Russian meddling.

Cornyn said on Thursday that he would talk with Burr about "what we need to do to wrap up our investigation."

"I wasn’t aware the subpoena was issued, it was really something done by committee staff, so I’m going to talk to the chairman and the other committee members and find out exactly where we are and what else we need to do to wrap up this investigation and report our findings to the public," he said.

Republicans argue the move is out of line with McConnell's proclamation earlier this week from the Senate floor that the Mueller investigation is "case closed," though the subpoena was issued at least a week before McConnell's speech.

Sen. Thom Tillis Thomas (Thom) Roland TillisThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting OVERNIGHT ENERGY: EPA head questions connection of climate change to natural disasters | Pebble Mine executives eye future expansion in recorded conversations | EPA questions science linking widely used pesticide to brain damage in children Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (R-N.C.), who like Cornyn is up for reelection next year, said in a tweet that "I agree with Leader McConnell: this case is closed."

Sen. Rand Paul Randal (Rand) Howard PaulRand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts Health officials tell public to trust in science MORE (R-Ky.), who is an ally of Trump's, was the first GOP senator to publicly criticize Burr.

"Apparently the Republican chair of the Senate Intel Committee didn’t get the memo from the Majority Leader that this case was closed," Paul said in a tweet.