Many presidents in history had dogs. This current one has a dog whistle. Americans witnessed it shown in a raging Sunday morning tweet about Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE, calling him a “corrupt politician” and probably a “very sick man” who has “not paid the price” for “what he has done” to our country.

We keep wondering just how low the president will go and just how deep his capacity is for the vile and virulent. But this is not just the frothing of a commander in chaos. It is dangerous. It is also a reminder to Republican senators to summon the moral courage to stop this erratic and vengeful president, not because of his threatening behavior to Schiff, but because of his threatening behavior to our national security and our social stability.

How can anyone on the White House staff remain, unless they are entirely at ease with a boss who fans hatred as much as Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE? If they are, in fact, willing and able to condone this bad behavior, they will learn that the history books are filled with disgraced accomplices to crimes of hate.

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How can decent Republican lawmakers remain silent in the wake of such a tweet? I am not talking about the loyal cheerleaders of the president like Mitch McConnell, Kevin McCarthy, Devin Nunes, and so forth. I am talking about those who know it in their hearts but somehow cannot let it escape their lips that a tweet such as that one is dangerous and even unpatriotic.

Does genuine support for tax cuts and deregulation require silence when the president takes it too far? Would you be similarly quiet if a Democratic president had tweeted the same about McConnell? Or McCarthy? Or you?

How can the great swath of decent Americans, including many of those who now question giving the president the benefit of the doubt in 2016, read a tweet like that and have any doubts about how he will behave if he is reelected? Does the dog whistle not raise any alarm bells about what he is willing to do without checks and balances or another general election?

How can any of the handful of Republican senators in the balance, such as Susan Collins, Mitt Romney, Lisa Murkowski, and Lamar Alexander, believe that exonerating the president will not set him loose on any remaining and wobbly restraints that are holding our decency and democracy together? Is a tweet like that really the work of one who has nothing to hide? Does it not smack of someone so vengeful that he would view nothing wrong in trying to extort the Ukrainians for opposition research on his opponent?

If the answers to any of these questions place political tribe ahead of the country, then it is not the president who bears the shame. It is all the rest.