G.O.P. Support for Trump Is Starting to Crack

Below the leadership level, Republicans are defying Trump more often, and McConnell and Ryan aren’t always standing in their way. You can see this defiance in the bipartisan Senate investigation of the Russia scandal. You can see it in the deal on Russian sanctions. And you can see it in the Senate’s failure, so far at least, to pass a health care bill.

.. During Watergate, as the political scientist Jonathan Bernstein has noted, most Republicans stood by Richard Nixon until almost the bitter end.

.. “The current congressional G.O.P. seems less supportive and more constraining of the Potus than basically any in history,” Glassman wrote to me, “save the unique circumstances of Andrew Johnson (who wasn’t really a Republican) and John Tyler (who bucked his party aggressively), neither of whom were elected.”

.. Many of today’s Republicans avoid going on television as Trump surrogates. They mock him off the record, and increasingly on the record, too. In recent weeks, eight senators have publicly stood in the way of a health care bill. Republican senators are also helping to conduct an investigation of Trump’s campaign and have backed the appointment of Robert Mueller as special counsel.

One reason is that they don’t fear Trump. About 90 percent of Republican House members won a larger vote share in their district last year than Trump did

.. In the months ahead, unfortunately, that level of resistance is unlikely to be sufficient. Trump has made clear that he isn’t finished trying to take health insurance away from millions of people or trying to hide the truth about his Russia ties. “The constitutional crisis won’t be if Trump fires Mueller,” as the A.C.L.U.’s Kate Oh put it. “The constitutional crisis is if Congress takes no real action in response.”