Republican lawmakers on Wednesday ripped the decision by the Senate Intelligence Committee to subpoena Donald Trump, Jr., the president’s eldest son and a key witness in the investigation into Russia's interference in the 2016 election.

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.), 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 closest Senate allies, swiped at Sen. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (N.C.), the chairman of the Senate Intelligence Committee, for prolonging the investigation into Russian interference in the 2016 election.

“Apparently the Republican chair of the Senate Intel Committee didn’t get the memo from the Majority Leader that this case was closed...” Paul tweeted in response to news reports that Burr has subpoenaed Trump Jr. to answer questions about his previous testimony to the panel.

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Senate Democrats such as Sen. Richard Blumenthal (Conn.) have urged congressional committees to review the testimony of key witnesses such as Trump Jr. to determine if their answers matched the findings of the Mueller report.

A spokesperson for the committee said Wednesday: “We do not discuss the details of witness engagements with the committee.”

House Minority Leader Kevin McCarthy Kevin Owen McCarthyMcCarthy threatens motion to oust Pelosi if she moves forward with impeachment Kate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House McCarthy's Democratic challenger to launch first TV ad highlighting Air Force service as single mother MORE (R-Calif.), another staunch Trump ally, slammed the subpoena, tweeting Wednesday afternoon that Trump Jr. “has already spent dozens of hours testifying in front of congressional committees.”

“Endless investigations — by either party — won’t change the fact that there was NO collusion,” McCarthy wrote in a tweet, citing a report by Axios, which broke the story of Trump Jr.’s subpoena.

“It’s time to move on. It’s time to focus on ISSUES, not investigations,” he added.

News that the Senate Intelligence Committee called on Trump Jr. to testify about matters related to its Russia investigation came shortly after Senate 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.) delivered a speech on the Senate floor declaring, “Case closed.”

“Two years of exhaustive investigation, and nothing to establish the fanciful conspiracy theory that Democratic politicians and TV talking heads had treated like a foregone conclusion. They told everyone there’d been a conspiracy between Russia and the Trump campaign. Yet on this central question, the special counsel’s finding is clear: Case closed. Case closed,” McConnell said.

McConnell also noted in the same speech that the Senate Intelligence Committee is coming out with a report on Russian efforts to undermine U.S. democracy.

He said the “upcoming report form the Select Committee on Intelligence” will help officials improve security ahead of the 2020 presidential election.

Burr on Tuesday told The Hill that he doesn’t expect his panel to hold any open hearings on Russian interference in the 2016 election for the remainder of this year.

He also said that he doesn’t think it necessary that special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE testify before Congress.

“The special prosecutor put out his report. It’s very thorough. It comes to a conclusion. Unless you want to reinvestigate the Mueller report, why do you need the special prosecutor to come in and tell you what he put on paper?” Burr told The Hill.

Burr added that “I’ve got reports to do, they don’t have anything to do with the Mueller report.”

“The Mueller report looked at criminality. Congress has no responsibility on criminality. If they do, they refer it to the Justice Department,” he said.

He said having Mueller testify in the Democratic-controlled House is likely “an exercise in politics.”

McConnell on Tuesday afternoon reiterated his argument that Congress needs to stop litigating the Russia controversy.

“My view is it’s time to move on. The independent counsel spent, the special counsel spent a couple of years, talked to a whole lot of people, filed his report and it seems to me we’ve got our answer. There was no collusion,” McConnell said.