The Memo: Republicans fear aftershocks from Trump-Corker feud

Republicans on Capitol Hill and beyond are worrying about the reverberations of the escalating feud between President TrumpDonald John TrumpTrump: 'Haven't thought about' pardons for Mueller target Pence: Rocket attack 'proves that Hamas is not a partner for peace' Conservation remains a core conservative principle MORE and Sen. Bob CorkerRobert (Bob) Phillips CorkerTrump keeps tight grip on GOP Brexit and exit: A transatlantic comparison Sasse’s jabs at Trump spark talk of primary challenger MORE (R-Tenn.).

The spat between the president and the chairman of the Senate Foreign Relations Committee has included Trump insulting Corker’s height and accusing him of having “begged” for a presidential endorsement. The Tennessean has likened the White House to an “adult day care center.”

At Tuesday’s White House briefing, press secretary Sarah Huckabee Sanders ratcheted up the confrontation further, accusing Corker of having “rolled out the red carpet for the Iran deal.” The president described the nuclear accord as an “embarrassment” during a speech to the United Nations General Assembly last month and could declare Iran to be noncompliant with the agreement soon.

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Sanders also took a notably noncommittal stance when asked about a call from Trump’s former chief strategist, Stephen Bannon, for Corker to “resign immediately.”

Asked about the demand, which Bannon made during an interview with Fox News’s Sean Hannity on Monday evening, Sanders said, “That’s a decision for Sen. Corker and the people of Tennessee.”

Corker aides take issue with the White House’s characterization of his approach to the Iran deal, noting that he ultimately voted against the accord, which was reached during President Obama’s time in the White House.

Republicans are perplexed by the vicious back-and-forth, which is coming at a time when Trump is already struggling mightily to make progress on his legislative agenda.

“There are not many Republican members of the Senate who have a lot of respect for the political skills of the president,” said GOP strategist and pollster Whit Ayres, who includes Corker and Sen. Marco RubioMarco Antonio RubioTrump UN pick donated to GOP members on Senate Foreign Relations panel Nunes on Mueller report: 'We can just burn it up' 18 state attorneys general call on Justice Dept to release Mueller report MORE (R-Fla.) among his past clients.

Ayres acknowledged that the relationship between the White House and Senate Republicans was “strained.”

Other more strident critics of Trump within the GOP noted that the president has already failed to keep Republican senators in line for crucial votes aimed at repealing and replacing the Affordable Care Act, also known as ObamaCare.

In that battle, Sens. John McCainJohn Sidney McCainGraham: McCain 'acted appropriately' by handing Steele dossier to FBI What should Democrats do next, after Mueller's report? Tom Daschle: McCain was a model to be emulated, not criticized MORE (R-Ariz.), Lisa MurkowskiLisa Ann MurkowskiRed dresses displayed around American Indian museum to memorialize missing, murdered native women Juan Williams: Don't rule out impeaching Trump The 25 Republicans who defied Trump on emergency declaration MORE (R-Alaska) and Susan CollinsSusan Margaret CollinsSenate rejection of Green New Deal won't slow Americans' desire for climate action Senate GOP poised to go 'nuclear' on Trump picks Overnight Health Care: CDC pushes for expanding HIV testing, treatment | Dem group launches ads attacking Trump on Medicare, Medicaid cuts | Hospitals, insurers spar over surprise bills | O'Rourke under pressure from left on Medicare for all MORE (R-Maine) proved impervious to White House pressure.

The main focus now is on tax reform. But no wide-ranging advance has been made on that topic since 1986, when Ronald Reagan was president, so success is far from guaranteed.

Many in the GOP believe his attacks on Corker are making a tricky climb even steeper.

“When you have a Congress so narrowly divided, [tax reform] is a monumental task, complicated by the president picking fights — and very bitter, personal fights — with people whose votes he has to have,” said John Stipanovich, a veteran Florida-based GOP operative and Trump critic with ties to the Bush family.

“John McCain has a brain tumor. Bob Corker is retiring. Susan Collins is probably going to be governor of Maine,” Stipanovich added. “They are not scared of Donald Trump!”

Some of Corker’s views of Trump are widely shared by Republican power brokers in the capital, including other lawmakers, but they are normally expressed only in private. Publicly, senators have largely confined themselves to expressing a desire for the spat between the two men to end.

Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyTreasury expands penalty relief to more taxpayers Overnight Health Care: Senators seek CBO input on preventing surprise medical bills | Oversight panel seeks OxyContin documents | Pharmacy middlemen to testify on prices | Watchdog warns air ambulances can put patients at 'financial risk' Drug prices are a matter of life and death MORE (R-Iowa) was asked about the furor on Monday and replied, “Both ought to cool it. Next question.”

On Tuesday, Sen. Roy BluntRoy Dean BluntRisk-averse Republicans are failing the republic Senate GOP poised to go 'nuclear' on Trump picks The Hill's Morning Report - Dems contemplate big election and court reforms MORE (R-Mo.) told CNN, “I’m supportive of both of them. I’d like to see it stop.”

One aide to a GOP senator told The Hill of her boss, “I think as a general rule, the senator is not really interested in all the Twitter back-and-forth.” This senator wanted “to keep the focus on legislation and moving forward, whatever the personal feelings,” the aide added.

But the likelihood of the feud going away appears slight when it is the president himself who is upping the ante.

On Tuesday morning, Trump referred to the Tennessee senator as “Liddle’ Bob Corker” and alleged that Corker was set up by The New York Times “to sound a fool.”

In an interview with the Times on Sunday, Corker had suggested that Trump could lead the nation toward “World War III” and that his performance should “concern anyone who cares about our nation.” He said that White House staff spent each day trying to “contain” the president.

Throughout the contretemps between Trump and Corker, some Republicans in Washington have expressed a weary lack of surprise.

“Trump is running an outside game working to appeal to his core base of support and doesn’t necessarily care how this may or may not affect his relationship with the Senate,” said Republican strategist Ron Bonjean.

“He has already set a precedent by publicly criticizing [Senate Majority Leader Mitch] McConnell and [Speaker Paul] Ryan, so it’s not shocking that he will take on a chairman and try to make him a punching bag.”

But the fear among many in the GOP is that Trump’s eagerness to get into the fray ultimately hurts himself — and his party’s agenda.

“I’m sure there are a lot of people who could play their roles more effectively,” said Ayres. “But as Harry Truman said about the presidency: The buck stops here.”

The Memo is a reported column by Niall Stanage, primarily focused on Donald Trump’s presidency.