Rich Lowry

King Features

Donald Trump, the erstwhile Democrat, independent and member of the Reform Party, finally has a fixed partisan identity.

The president may be besieged, unpopular and prone to lashing out self-destructively, but all of this cements his bond to his party rather than erodes it. Commentators who ask wishfully and plaintively, "When will Republicans dump Trump and save themselves?" are missing the point: Trump's weakness makes him more Republican than ever before.

It was possible to imagine Trump, with a head of steam after his upset victory in November, cowing swamp-dwelling Republicans and wooing infrastructure-loving, anti-trade Democrats into supporting a populist congressional agenda. But this scenario would have required a strong, focused president marshaling his popularity and driving Congress.

We've seen close to the opposite. Whatever Trump's true ideological predilections, there's no place for him to go.

Make deals with the Democrats? At this point, Democrats are more likely to cooperate with Sergey Kislyak on an infrastructure package than with Donald Trump.

Dump or triangulate away from Republicans? Well, then who would do Russian investigation defense, besides a handful of White House aides and outside media loyalists?

Imagine what the Comey or Sessions hearings would have looked like if Republicans had joined Democrats in the pile-on. The need for support on Capitol Hill could well get more urgent if things go badly the next year and a half.

If Democrats take the House, Trump will rely on Republicans for an impeachment defense and, if it comes to that, for the votes in the Senate to block removal. In one sense, this suits Trump. He may have a questionable partisan pedigree, but he is a natural partisan — smash-mouth, heedless of process and norms, willing to make whatever argument suits him at any particular time.

There have been many Republicans who have opposed Chuck Schumer before; it took Trump to call him a "clown." As for congressional Republicans, they, too, don't have much choice. Whatever their true feelings about Trump, his fate is their fate.

First, a president's approval rating heavily influences midterm elections, especially the campaign for the House. Republicans dumping Trump wouldn't make him any more popular. Second, such a distancing is not really politically practicable. If Republicans try to skitter away from Trump, their base will roast them. Third, Republicans want to get some things done legislatively. A poisonous split with the White House wouldn't help.

Trump may be a mercurial and frustrating partner, but he is a partner all the same. Finally, most Republicans — quite legitimately — think the Russian controversy is a media-driven travesty. If there were a smoking gun, this posture would probably change (obviously, in that circumstance, it should change).

But Democrats are in no position to lecture Republicans on cutting loose a president of their own party when they twisted themselves in knots to defend Bill Clinton after he lied under oath over an affair that violated every feminist principle the party professed to hold.

If Trump and Republicans had their druthers, neither would be in quite this position.

But this is the reality for everyone. For now, there's no way out, only through, and through it together.

Rich Lowry is editor of the National Review.