Trump is going all-in on immigration in the closing stretch of the midterms. That may backfire.

President Trump has landed on a familiar theme to try to rev up Republican enthusiasm heading into the final stretch of the 2018 campaign: immigration. And specifically, Latin Americans crossing illegally into the U.S. via the U.S.-Mexico border. Immigration was in many ways the animating force of Trump's 2016 campaign, and while Republicans point to the Brett Kavanaugh Supreme Court confirmation battle as a boost to GOP energy, "the president realizes he needs to keep that momentum going," GOP strategist Matt Moore tells The Wall Street Journal. "Illegal immigration animates the Republican Party base like few other issues."

But, the Journal notes, "Democrats say the focus on immigration is backfiring by motivating progressives and independent voters," and the poll numbers, so far, are on their side. Trump's hardline immigration policies, including the separation of migrant families, are broadly unpopular, but they poll well among Republicans. "Despite Mr. Trump's focus on the issue, it is barely registering in political advertising by GOP candidates," the Journal reports. "Less than 11 percent of all ads in Senate, House, and governor races through Tuesday had an anti-immigration message, according to Kantar Media/CMAG."

Notably, the focus on Trump's immigration policies may hurt Republicans in the suburban House districts they need to win to keep control of Congress. Trump "clearly views it as one of the reasons for his political success," says GOP pollster David Winston. "But it's still all about the economy and jobs." You can read more immigration politics and the midterms at The Wall Street Journal.

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