Graham: If I were Trump Jr.'s lawyer, 'I'd be reluctant to put him back in this circus'

Sen. Lindsey GrahamLindsey Olin GrahamElection security bills face GOP buzzsaw Election security bills face GOP buzzsaw House Intel Republican: 'Foolish' not to take info on opponent from foreign ally MORE (R-S.C.) said he would be reluctant to submit Donald Trump Jr.Donald (Don) John TrumpTrump remarks deepen distrust with intelligence community Lieu trolls Trump with 'warning' to foreign powers on office door Lieu trolls Trump with 'warning' to foreign powers on office door MORE to further questioning from the Senate Intelligence Committee after the panel subpoenaed him in connection with its Russia investigation.

“I’m not his lawyer, so it’s up to him, but if I were his lawyer I’d be reluctant to put him back in this circus,” Graham, a staunch ally of President TrumpDonald John TrumpTrump defends Stephanopolous interview Trump defends Stephanopolous interview Buttigieg on offers of foreign intel: 'Just call the FBI' MORE, said on Capitol Hill Thursday.

The committee's subpoena was the first to a child of the president.

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Trump Jr. previously testified behind closed doors to both the House and Senate intelligence panels as well as the Senate Judiciary Committee, which Graham now chairs, in 2017.

Trump Jr. has said that he was “peripherally aware” of his father’s business interests in Russia, though the president’s former attorney Michael CohenMichael Dean CohenThe Hill's Morning Report - Trump and House Democrats resume battle The Hill's Morning Report - Trump and House Democrats resume battle House Oversight votes to hold Barr, Ross in contempt MORE testified earlier this year that Trump Jr. was more involved in working to establish a Trump Tower in Moscow than his testimony indicated.

The Senate Intelligence Committee has been conducting its own investigation in parallel with special counsel Robert MuellerRobert (Bob) Swan MuellerKamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump MORE into Russian election interference in 2016.

Trump Jr. did not speak to the special counsel, who did not find sufficient evidence to prove that any Trump campaign associates conspired with the Russian government to meddle in the 2016 race.

A handful of Republicans have already slammed Senate Intelligence Committee Chairman Richard BurrRichard Mauze BurrElection security bills face GOP buzzsaw Election security bills face GOP buzzsaw Tillis dodges primary challenge in NC MORE's (R-N.C.) decision to subpoena Trump Jr., saying Washington should move on from investigating Russian interference following the Mueller probe’s conclusion.

“The Mueller Report cleared @DonaldJTrumpJr and he’s already spent 27 hours testifying before Congress,” Sen Thom TillisThomas (Thom) Roland TillisTrump puts GOP in tough spot with remarks on foreign 'dirt' Trump puts GOP in tough spot with remarks on foreign 'dirt' Trump hit with fierce backlash over interference remarks MORE (R-N.C.), who is up for reelection in 2020, tweeted Thursday. “Dems have made it clear this is all about politics. It’s time to move on & start focusing on issues that matter to Americans.”

"Apparently the Republican chair of the Senate Intel Committee didn’t get the memo from the Majority Leader that this case was closed...," Sen. Rand PaulRandal (Rand) Howard PaulOvernight Defense: Pompeo blames Iran for oil tanker attacks | House panel approves 3B defense bill | Trump shares designs for red, white and blue Air Force One Senate rejects effort to block Trump's Qatar, Bahrain arms sales Senate rejects effort to block Trump's Qatar, Bahrain arms sales MORE (R-Ky.) tweeted, referring to Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellElection security bills face GOP buzzsaw Election security bills face GOP buzzsaw Overnight Defense: Trump doubles down on claim Iran attacked tankers | Iran calls accusations 'alarming' | Top nuke official quietly left Pentagon | Pelosi vows Congress will block Saudi arms sale MORE's speech this week declaring the "case closed" on Mueller's probe.

Mueller did not find sufficient evidence to prove that any Trump campaign associates conspired with the Russian government to influence the 2016 race. Trump Jr. did not speak to the special counsel, but was mentioned in the report.

Updated at 1:02 p.m.