President Donald Trump's feud with GOP Sen. Bob Corker of Tennessee escalated over the weekend, and in an interview with the New York Times, Corker flatly warned that Trump's antics may set us "on the path to World War III."

But while that is obviously alarming, what Corker said elsewhere in the interview may end up having more of an impact, because it opens the door to a whole new round of press scrutiny of the GOP's ongoing enabling of Trump. Corker confirmed that most Senate Republicans view Trump as, well, dangerous and crazy in The Times:

"Mr. Trump poses such an acute risk, the senator said, that a coterie of senior administration officials must protect him from his own instincts. "I know for a fact that every single day at the White House, it's a situation of trying to contain him," Mr. Corker said in a telephone interview. . . .

"Without offering specifics, he said Mr. Trump had repeatedly undermined diplomacy with his Twitter fingers. 'I know he has hurt, in several instances, he's hurt us as it relates to negotiations that were underway by tweeting things out,' Mr. Corker said.

"All but inviting his colleagues to join him in speaking out about the president, Mr. Corker said his concerns about Mr. Trump were shared by nearly every Senate Republican.

Donald Trump's least presidential moments so far... Show all 30 1 /30 Donald Trump's least presidential moments so far... Donald Trump's least presidential moments so far... Threatening to shut down Twitter after being fact-checked After the president tweeted that voting by post would be "substantially fraudulent", Twitter attached a warning label to his tweet and referred readers to a site which explained how the claim was "unsubstantiated". Trump then said Twitter was "stifling free speech" and that he may have to shut it down, something which he would not have the power to do AFP/Getty Donald Trump's least presidential moments so far... Flippantly dismissing a serious allegation of sexual assault When author E Jean Carroll accused Trump of raping her, the president responded: “Number one, she’s not my type. Number two, it never happened. It never happened, OK?" AFP/Getty Donald Trump's least presidential moments so far... Insulting the Mayor of London as he landed in London Just before touching down at Stansted Airport for his state visit, Trump took time out to @ the London mayor Sadiq Khan on twitter. He said that Khan has done a "terrible job"as mayor and that he is a "stone cold loser" Reuters Donald Trump's least presidential moments so far... Taking plenty of "Executive Time" The president's official schedule sets aside the hours from 8 to 11am daily for "Executive Time". Further intermittent periods of "Executive Time" are scheduled throughout any given day, ranging from 15 minutes to 3 hours. His duties in these hours have not been officially disclosed, though Axios reports that he spends them watching TV, reading the newspapers and tweeting Getty Donald Trump's least presidential moments so far... Shutdown the government for over a month in an effort to secure funding for his wall With Mexico declining to pay for the wall, the president has faced difficulty in raising the required $5bn at home. Due to his demand that the money for the wall be included in the budget, and Congress's refusal, the government partially shut down on 22 December 2018. It remained shut for over a month, the longest period in history Getty Donald Trump's least presidential moments so far... Joking about the Nazi occupation of France to President Macron In this tweet from 13 November 2018, the president mocks Emmanuel Macron's suggestion of a "true, European army" by invoking the conflict between France and Germany in the world wars Donald Trump's least presidential moments so far... 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As to why he would have intended to use such bizarre phrasing, he did not comment Reuters Donald Trump's least presidential moments so far... Colouring in the US flag wrong The president coloured in the US flag wrongly during a visit to a children's hospital in Columbus, Ohio. He added a blue stripe where in tradition, and statute, there have been only white and red stripes AFP/Getty Donald Trump's least presidential moments so far... Firing a Secretary of State over Twitter The president announced on Twitter that he was appointing Mike Pompeo as Secretary of State, much to the surprise of then Secretary of State Rex Tillerson Donald Trump's least presidential moments so far... Quoting a catchphrase from a reality TV show when discussing police brutality While addressing the issue of black athletes not standing for the national anthem in protest of police brutality, the president made reference to his catchphrase from reality TV show "The Apprentice": you're fired! Reuters Donald Trump's least presidential moments so far... Calling African nations "S***hole Countries" Ever one for diplomacy, the president reportedly referred to African nations as "s***hole countries". Asked to confirm this when meeting with Nigeria's President Buhari, Trump stated that there are "some countries that are in very bad shape". Reuters Donald Trump's least presidential moments so far... Defending Russian President Vladimir Putin Trump appeared to equate US foreign actions to those of Russian president Vladimir Putin, saying: “There are a lot of killers. You think our country’s so innocent?” Reuters Donald Trump's least presidential moments so far... Asking for people to 'pray' for Arnold Schwarzenegger At the National Prayer Breakfast, Trump couldn’t help but to ask for prayers for the ratings on Arnold Schwarzenegger’s show to be good. Schwarzenegger took over as host of “The Apprentice” — which buoyed Trump’s celebrity status years ago Getty Donald Trump's least presidential moments so far... Hanging up on Australian PM Malcolm Turnbull Early in his presidency, Trump reportedly hung up the phone on Australian prime minister Malcolm Turnbull after the foreign leader angered him over refugee plans. Mr Trump later said that it was the “worst call” he had had so far Getty Donald Trump's least presidential moments so far... The 'Muslim ban' Perhaps one of his most controversial policies while acting as president, Trump’s travel ban targeting predominantly Muslim countries has bought him a lot of criticism. The bans were immediately protested, and judges initially blocked their implementation. The Supreme Court later sided with the administration’s argument that the ban was developed out of concern for US security Getty Donald Trump's least presidential moments so far... Praising crowd size while touring Hurricane Harvey damage After Hurricane Harvey ravaged southeastern Texas, Trump paid the area a visit. While his response to the disaster in Houston was generally applauded, the president picked up some flack when he gave a speech outside Houston (he reportedly did not visit disaster zones), and praised the size of the crowds there AP Donald Trump's least presidential moments so far... 'Little Rocket Man' During his first-ever speech to the United Nations General Assembly, Trump tried out a new nickname for North Korea leader Kim Jong-un: Rocket Man. He later tweaked it to be “little Rocket Man” as the two feuded, and threatened each other with nuclear war. During that speech, he also threatened to totally annihilate North Korea Donald Trump's least presidential moments so far... Attacking Sadiq Khan following London Bridge terror attack After the attack on the London Bridge, Trump lashed out at London Mayor Sadiq Khan, criticising Khan for saying there was “no reason to be alarmed” after the attack. Trump was taking the comments out of context, as Khan was simply saying that the police had everything under control Getty Donald Trump's least presidential moments so far... Claiming presenter Mika Brezinkski was 'bleeding from the face' Never one not to mock his enemies, Trump mocked MSNBC’s “Morning Joe” co-host Mika Brzezinski, saying that she and co-host Joe Scarborough had approached him before his inauguration asking to “join” him. He noted that she was “bleeding badly from a face-lift” at the time, and that he said no MSNBC Donald Trump's least presidential moments so far... Claiming the blame for Charlottesville was on 'both sides' Trump refused to condemn far-right extremists involved in violence at 'the march for the right' protests in Charlottesville, even after the murder of counter protester Heather Heyer AP Donald Trump's least presidential moments so far... Retweeting cartoon of CNN being hit by a 'Trump train' Trump retweeted a cartoon showing a Trump-branded train running over a person whose body and head were replaced by a CNN avatar. He later deleted the retweet Donald Trump's least presidential moments so far... Tweeting about 'slamming' CNN Trump caught some flack when he tweeted a video showing him wrestling down an individual whose head had been replaced by a CNN avatar. Trump has singled CNN out in particular with his chants of “fake news” Donald Trump's least presidential moments so far... Firing head of the FBI, James Comey Trump’s firing of former FBI Director James Comey landed him with a federal investigation into Russia’s meddling in the 2016 election that has caused many a headache for the White House. The White House initially said that the decision was made after consultation from the Justice Department. Then Mr Trump himself said that he had decided to fire him in part because he wanted the Russia investigation Mr Comey was conducting to stop Getty Donald Trump's least presidential moments so far... Not realising being president would be 'hard' Just three months into his presidency, Trump admitted that being president is harder than he thought it would be. Though Trump insisted on the 2016 campaign trail that doing the job would be easy for him, he admitted in an interview that living in the White House is harder than running a business empire Reuters Donald Trump's least presidential moments so far... Accusing Obama of wiretapping him Trump accused former president Barack Obama of wire tapping him on twitter. The Justice Department later clarified: Obama had not, in fact, done so Reuters Donald Trump's least presidential moments so far... Claiming there had been 3 million 'illegal votes' Trump was never very happy about losing the popular vote to Hillary Clinton by 2.8 million ballots. So, he and White House voter-fraud commissioner Kris Kobach have claimed that anywhere between three and five million people voted illegally during the 2016 election. Conveniently, he says that all of those illegal votes went to Clinton. (There is no evidence to support that level of widespread voter fraud.) Donald Trump's least presidential moments so far... Leaving Jews out of the Holocaust memorial statement Just days after taking office, Trump’s White House issued a statement on International Holocaust Remembrance Day, but didn’t mention “jews” or even the word “jewish” in the written statement Getty Donald Trump's least presidential moments so far... Anger over Inauguration crowd size Trump’s inauguration crowd was visibly, and noticeably, smaller than that of his predecessor, Barack Obama. But, he really wanted to have had the largest crowd on record. So, he praised it as the biggest crowd ever. Relatedly, Trump also claimed that it stopped raining in Washington at the moment he was inaugurated. It didn’t, the day was very dreary Reuters

" 'Look, except for a few people, the vast majority of our caucus understands what we're dealing with here,' he said, adding that 'of course they understand the volatility that we're dealing with and the tremendous amount of work that it takes by people around him to keep him in the middle of the road.' "

Elsewhere in the interview, Corker declined to answer when asked if he believes Trump is unfit for the presidency. But the only reasonable way to read all these comments is as a declaration that Trump is indeed unfit - and that most Republicans know it. After all, Corker had previously said that Trump's inner circle is helping to "separate our country from chaos." Now he has added that Trump needs to be restrained by his inner circle from devolving into conduct that could end up unleashing untold global destruction - and that most Republicans know it.

Corker is getting a lot of press plaudits for his unvarnished appraisal. But as James Fallows writes in The Atlantic, there is a good deal that Corker can actually do right now if he wants to mitigate the threat that he himself says Trump poses. As chairman of the Senate Foreign Relations Committee, he has a range of powers that could help constrain Trump, including the power to hold public hearings to draw public attention to the ways in which Trump's temperament threatens untold damage. At a minimum, Corker can be asked whether he intends to do these things, and if not, why not.

But whatever Corker says and does now, his new comments should precipitate a fundamental change in the way the press treats the ongoing GOP enabling of Trump. Corker has forced out into the open the fact that Republicans recognize the sheer abnormality and danger to the country of the situation we're in, which opens the door for much tougher media questioning of them about their awareness of - and acquiescence to - this state of affairs.

Bob Corker unleashed an extraordinary attack on President Trump in an interview (Mark Wilson/Getty Images)

This can start with a simple query: Do Republicans agree with Corker that Trump regularly needs to be constrained by his top advisers from engaging in conduct that threatens severe damage to the country and the world? If so, what are Republicans prepared to do about it?

In August, Jane Chong and Benjamin Wittes offered a useful set of guidelines for thinking about Trump's misconduct in the Lawfare blog. They divided it into three categories. First, there are his "abuses of power," such as the nonstop self-dealing, the pardoning of former sheriff Joe Arpaio, and the firing of his FBI director. Second, there are his "failures of moral leadership," which constitute a general degradation of his office via, among other things, his unprecedented, serial lying and efforts to destroy the institutional legitimacy of the free press. To this second category we can add Trump's refusal to unequivocally condemn the Charlottesville, Virginia, white supremacists and the White House's use of taxpayer funds to stage a weekend stunt in which Vice President Mike Pence walked out of a football game, which are both part of a broader effort to continue stoking divisions.

Third, there is the "abandonment of the basic duties of his office," which includes the failure to make appointments and (I would add) the deep rot of bad faith that has infested the White House's approach to policy: He indicated he'd sign anything at all that would let him boast of destroying Barack Obama's signature accomplishment. I would suggest a fourth category of misconduct: Trump's sheer megalomaniacal indifference to the fundamental notion that his office confers on him any obligation to the public of any kind. This overlaps with the conduct discussed above and also includes the refusal to release his tax returns and his ongoing sabotage of the Affordable Care Act, which could harm millions.

As Chong and Wittes note, what's challenging is to determine what sort of level of degradation of our institutions, political system and norms of political conduct all of this misconduct adds up to when taken together. We do know that congressional Republicans continue to enable many of these strands in isolation, and they continue to airbrush away the significance of misconduct that is glaring enough to require their condemnation, usually by making some variation of the claim that Trump is learning on the job. But Corker has now asserted that Republicans know Trump's presidency constitutes an ongoing, abnormal, multifaceted danger to the country. This should intensify media scrutiny of this series of dodges, evasions and enabling exercises, and make it harder for Republicans to get away with them.