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Pressure rising on GOP after Trump–DOJ fight’s latest turn

Republican senators who have warned the White House for months not to interfere with special counsel Robert MuellerRobert (Bob) MuellerWhy a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel CNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump MORE’s investigation are coming under new pressure given President TrumpDonald TrumpSenators given no timeline on removal of National Guard, Capitol fence Democratic fury with GOP explodes in House Georgia secretary of state withholds support for 'reactionary' GOP voting bills MORE’s latest demands for the Department of Justice.

Republican senators believe that if Trump fired Mueller or obviously interfered in his investigation, it would backfire politically and potentially hurt their chances of keeping control of Congress.

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They want to avoid an all-out war between Trump and Justice that might draw parallels to the Nixon-era “Saturday Night Massacre,” when senior department officials resigned instead of complying with orders to fire a special counsel.

“I don’t like seeing demands made, especially about political issues,” Sen. Bob CorkerRobert (Bob) Phillips CorkerIt's time for Biden's Cuba GOP lawmaker patience runs thin with Trump tactics Former GOP senator: Republicans cannot let Trump's 'reckless' post-election claims stand MORE (R-Tenn.) said Monday in reaction to Trump’s demand that the Department of Justice investigate the FBI’s use of an informant during its investigation of the 2016 election.

“I don’t think it’s a good idea. I think it’s better to allow the Department of Justice to make its own decisions and not comment,” said Sen. Susan CollinsSusan Margaret CollinsKlain on Manchin's objection to Neera Tanden: He 'doesn't answer to us at the White House' Overnight Health Care: Johnson & Johnson vaccine safe, effective in FDA analysis | 3-4 million doses coming next week | White House to send out 25 million masks Biden's picks face peril in 50-50 Senate MORE (R-Maine).

The possibility of a standoff between the White House and Justice that would evoke the firing of Watergate-era special prosecutor Archibald Cox faded for the time being on Monday when officials said the president had agreed to Deputy Attorney General Rod RosensteinRod RosensteinRosenstein: Zero tolerance immigration policy 'never should have been proposed or implemented' Comey argues Trump shouldn't be prosecuted after leaving Oval Office Trump turns his ire toward Cabinet members MORE’s decision to refer the matter to the department’s inspector general.

White House press secretary Sarah Huckabee Sanders said in a statement that Justice, FBI and intelligence officials reached an agreement with Trump during a meeting Monday afternoon that the inspector general should “expand its current investigation to include any irregularities with the Federal Bureau of Investigation’s or the Department of Justice’s tactics concerning the Trump Campaign.”

That’s good news for GOP senators worried about getting between Trump and the Justice Department. But it’s far from clear how long the detente will last.

“It is important for members of Congress to protect the integrity of the investigation into Trump,” said Darrell West, director of governance studies at the Brookings Institution.

“They cannot allow the president to compromise the investigation or keep it from running its full course.”

Sen. John CornynJohn CornynPassage of the John Lewis Voting Rights Advancement Act is the first step to heal our democracy Biden signs supply chain order after 'positive' meeting with lawmakers Democrats look to improve outreach to Asian and Latino communities MORE (Texas), the No. 2 Republican in the Senate, said Rosenstein had made the right call — but defended Trump at the same time for wanting to make sure Obama-era officials weren’t taking improper actions against him.

“I thought the president’s point was an important one,” he told reporters. “It is unthinkable ... that the leader of the opposing political party would have the authority to use the FBI to place an informant, potentially, in a political campaign of his opponents. And, you know, we need to know more about that.”

“I think Rod Rosenstein ... made the right decision,” he added.

Trump allies for days have said there may have been an informant embedded in the Trump campaign. No evidence has suggested this was a reality.

Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeKlain on Manchin's objection to Neera Tanden: He 'doesn't answer to us at the White House' Tanden's path to confirmation looks increasingly untenable On The Money: What's next for Neera Tanden's nomination MORE (R-Ariz.), a frequent critic of Trump’s, also said Rosenstein “did what he should have done.”

“That’s where it belongs,” he said of the decision to let the inspector general review it.

Flake said it would be inappropriate for the department to “allow the president to dictate who’s investigated and who isn’t.”

“That’s just not the president’s call,” he said. “It never has been.”

Legal experts say Trump’s weekend attacks took his battle with the law enforcement agency to a new level.

“He’s certainly crossing a line,” said Harry Litman, a former U.S. attorney and deputy assistant attorney general. “It’s foreboding and deeply inappropriate for a president to be calling for this kind of criminal investigation of his perceived enemies.”

“The second order problem here is these are not political enemies, this is the FBI. There’s not an Obama FBI and a Trump FBI,” he added. “It is the Federal Bureau of Investigation and their watchword is they don’t initiate investigations for political reasons.”

Litman noted that the FBI reportedly used an informant to solicit information from two Trump campaign officials, George PapadopoulosGeorge Demetrios PapadopoulosTrump supporters show up to DC for election protest Trump pardons draw criticism for benefiting political allies Klobuchar: Trump 'trying to burn this country down on his way out' MORE and Carter Page, after receiving evidence that they had suspicious Russian contacts.

The FBI launched a counterintelligence investigation into Trump’s campaign after Australian officials alerted U.S. intelligence that Papadopoulos had bragged during a night of drinking at a London bar that Russia had acquired information that would hurt Democratic nominee Hillary ClintonHillary Diane Rodham ClintonShelby endorses Shalanda Young for OMB director should Biden pull Tanden's nomination Jennifer Palmieri: 'Ever since I was aware of politics, I wanted to be in politics' Cruz: Wife 'pretty pissed' about leaked Cancun texts MORE’s chances in the 2016 presidential election.

Former federal prosecutors say the use of an informant to acquire information is routine and doesn’t even require a search warrant.

They say that Trump’s characterization of the use of the informant as a surveillance operation is misleading.

“It’s completely false to say there was an FBI person planted there,” said Litman. “To use a confidential informant doesn’t even require a search warrant. That’s something that every law enforcement agency does every day.”

Matthew Orwig, a former U.S. attorney for the Eastern District of Texas, said there’s “nothing improper” about using an informant.

“This is all going to depend on what exactly the nature of the informant and the purpose of the informant,” he said, but added “the technique itself is absolutely accepted.”

“There’s certainly valid concerns and there should always be a lot of respect for the independence of the department,” Orwig added. “Should there be a heightened awareness about something that interferes with the independence of the Department of Justice or that interferes with the role of law enforcement?”

“Skepticism is valid,” he said.

Jordain Carney contributed.