Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE has agreed to appear before the Senate Intelligence Committee for a second round of questions, complying with a subpoena from Chairman 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 (R-N.C.), who came under fire from fellow Republicans for demanding the testimony.

Trump Jr. struck the deal Tuesday to interview with the panel next month for between two and four hours. The committee had originally a set a 5 p.m. deadline on Monday for him to respond.

Questions about the Trump Tower project in Moscow and the June 2016 Trump Tower meeting between Trump campaign officials and Russian lawyer Natalia Veselnitskaya are fair game, according to a source who was briefed on the deal.

Another source said the committee outlined 10 topics it hoped to discuss with Trump Jr., but the scope of the interview was negotiated down to six topics. The two sides also agreed this would be Trump Jr.’s last appearance before the committee.

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The agreement ends a tense standoff that divided Republican lawmakers for the past week.

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 staunchest allies, including Sens. 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.) and Ted Cruz Rafael (Ted) Edward CruzCruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP MORE (R-Texas), as well as 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.), argued that calling Trump Jr. before the committee for another round of questioning was unnecessary after 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 failed to find evidence of conspiracy between Trump’s 2016 campaign and Russia.

The intense pressure raised questions about whether Burr would back down.

Burr’s committee has been negotiating with Trump Jr. since December to appear for a second time to answer questions. The first time, Trump Jr. only answered questions from committee staff.

Trump Jr. initially agreed to testify to the committee in March but then backed out and rescheduled his appearance for April, according to a briefing that Burr gave to Senate GOP colleagues last week.

When Trump Jr. again broke his agreement to appear before the committee last month, the Intelligence Committee warned he would face a subpoena.

The source said Trump Jr.’s lawyers initially declined to let their client appear for a second grilling after the Mueller report failed to find any criminal misconduct. But faced with extended civil litigation or a possible Senate vote on contempt, Trump Jr. on Tuesday agreed to appear for a second time.

Trump Jr. had been holding out as he sought restrictions on the amount of time he would spend before the committee and the scope of the questions he’d have to answer.

Trump Jr.’s legal team drafted a letter, which was viewed by The Hill, explaining that he would not plead the Fifth but that he would defy the subpoena and risk being held in contempt of Congress.

In the letter, which was never sent, the lawyers argued that Trump Jr. had already testified for 25 hours, which they said was 14 hours longer than former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE testified about the deadly attack on the U.S. Consulate in Benghazi, Libya.

His lawyers questioned the committee’s motives for calling Trump Jr. back for testimony, arguing that there was no reason for him to respond to claims made by Trump’s former 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, who pleaded guilty to lying to Congress and is serving a prison sentence.

At 4:15 p.m. on Monday, 45 minutes before the deadline, the committee staff called Trump Jr.’s legal team to extend the deadline by 24 hours in hopes of reaching a deal. The two sides came to an agreement late in the afternoon on Tuesday, just before the deadline expired.

President Trump on Tuesday called the treatment of his eldest son “very unfair.”

“It’s really a tough situation because my son spent, I guess, over 20 hours testifying about something that [special counsel Robert] Mueller said was 100 percent OK,” Trump told reporters at the White House. “And now they want him to testify again. I don’t know why. I have no idea why. But it seems very unfair to me."

The fight over Trump Jr.’s appearance had become a distraction in the Senate, where Judiciary Committee Chairman Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) on Sunday took the highly unusual step of urging the president’s son to ignore his colleague’s subpoena.

In doing so, Graham broke one of the Senate’s unwritten rules, as it is considered bad form to even speak for a colleague. Urging a potential witness to ignore a colleague’s subpoena is on a whole other level.

Burr appeared annoyed Tuesday when asked about Graham’s advice.

“I’m not addressing any questions on witnesses and [if] that’s what they’re commenting on. You need to talk to Lindsey,” Burr said. “Go talk to them and ask them what they meant.”

“I’m not going to address anything that deals with engagement of witnesses. Period. End of end of sentence,” he said, growing red in the face. “If you guys have got some real questions, shoot ‘em. If not, thank you, good try. I’m not going to answer them.”

Graham, a Trump ally who is up for reelection next year, made a splash over the weekend when he told Fox Business, “If I were Donald Trump Jr.’s lawyer, I would tell him, ‘You don’t need to go back into this environment anymore. You’ve been there for hours and hours and hours and nothing being alleged here changes the outcome of the Mueller investigation.’ ”

The statement sparked an angry backlash from Democrats and puzzled responses from GOP colleagues.

By Tuesday morning more than 65,000 people were using #LindseyGrahamResign on Twitter after a Democratic super PAC urged supporters to retweet it.

Sen. Richard Blumenthal (D-Conn.), a member of the Judiciary Committee, said that Graham’s statement conflicted with statements he made while serving in the House arguing that former President Bill Clinton William (Bill) Jefferson ClintonEpstein podcast host says he affiliated with elites from 'both sides of the aisle' Ruth Bader Ginsburg lies in repose at Supreme Court Business groups start gaming out a Biden administration MORE could be impeached for failing to cooperate with congressional subpoenas.

Sen. Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (D-Va.), the vice chairman of the Intelligence Committee, took a little jab at Graham by arguing that potential witnesses are more likely to comply with his committee’s subpoenas because it’s viewed as less partisan than the Judiciary panel.

“I know there’s been a long history of ignoring some of the Judiciary Committee subpoenas and actions. So far our committee’s not had that approach,” he said.

Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyThe Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy Read: Senate GOP's controversial Biden report MORE (R-Iowa), the former chairman of the Judiciary Committee, said Graham’s statement “may be unusual” but noted that Graham “is a lawyer and I’m not.”

Graham’s comment was all the more surprising as it came after Burr explained to colleagues at a meeting Thursday the lengths his committee went to in an effort to get the president’s eldest son to make himself available for a second round of questioning.

On Tuesday, Graham reiterated his argument that Trump Jr. had no obligation to submit himself for new questioning.

“Mueller was the final word, I thought, on Russian activity with the Trump campaign, so you’re going to run into a problem as Congress of getting people to cooperate after they’ve been [before committees] multiple times,” he said. “I’m just making the observation that I’m worried now about where all this is headed.”

Graham’s split with Burr reflects broader division among Republican lawmakers over how hard to press for answers on Russia’s interference in the 2016 presidential election in the wake of Mueller’s report.

Paul on Sunday called the subpoena “a real travesty of justice.”

“I think it’s very unfair to the president and the president’s family on this,” he said on John Catsimatidis’s radio show.

But 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.), Paul’s home-state colleague, defended Burr on Tuesday.

Asked if he agreed with Trump’s charge that Burr was treating Trump Jr. unfairly, McConnell, who is close to Burr, declined to criticize his colleague.

“I asked him to undertake this investigation into Russian collusion a couple of years ago. He's indicated publicly that he believes they will find no collusion and we are hoping that we will get a report sometime soon,” the GOP leader told reporters after a lunch meeting with fellow Republican senators.

Jordan Fabian and Jordain Carney contributed.