Trump Is Getting Worse at His Job

By Jonathan Bernstein and John Guida

Mr. Bernstein is a political scientist and a writer of the newsletter Good Politics/Bad Politics. Mr. Guida is an editor in Opinion.

President Trump is routinely called powerful and also weak. He holds an iron grip on the G.O.P., helping to dispatch such perceived enemies as Senators Bill Cassidy and John Cornyn, and Representative Thomas Massie.

But on Wednesday, a handful of House Republicans voted to try to rein in the........

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