Even incremental movement toward polarizing Americans over Israel undermines the long-term security of the Jewish state, which has long rested on the firm foundation of bipartisan American support.

Mr. Netanyahu appears blind to this danger. He has chosen to reap the short-term benefits of Mr. Trump’s embrace, delighting in small victories like the decision to move the American Embassy to Jerusalem and, at Mr. Trump’s urging, preventing two Muslim congresswomen, Ilhan Omar of Minnesota and Rashida Tlaib of Michigan, from making an official visit to Israel.

Mr. Trump is also doing Israel no favors over the long haul by discarding long-running American efforts to address the hopes and grievances of Palestinians and Israelis through a negotiated deal.

For Democrats, the challenge is to resist the easy gratification of reflexively opposing what Mr. Trump supports — or supporting what he opposes.