WASHINGTON — A harder civics test. Stricter social media vetting. Neighborhood investigations into people’s “moral character.”

The Trump administration is erecting new hurdles for lawful permanent residents applying for U.S. citizenship, part of a broader effort to tighten an immigration system that federal officials say has become too lax. Officials are reviving old vetting standards and adding new requirements that emphasize cultural assimilation and more aggressively screen applicants for “anti-American” views.

Joseph Edlow, director of U.S. Citizenship and Immigration Services, recently said he was “declaring war” on anyone who wants to naturalize but “doesn’t want the responsibility of what it means to actually be a U.S. citizen.”

Some immigrant advocacy groups contend that the mov

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