The city of Boston picked up substantial support in its legal battle with the Trump administration as the Massachusetts attorney general, dozens of cities and counties across the country, former law enforcement officials, and advocacy groups filed briefs urging a judge to toss the government’s lawsuit challenging the city’s “sanctuary” immigration policy.

The Boston Trust Act, which limits cooperation between police and federal immigration agents, “promotes public safety and fosters trust between local law enforcement and the communities they serve, helping to make Boston the safest major city in America,” Massachusetts Attorney General Andrea Campbell said in a statement after filing the amicus brief in support of the city’s motion to dismiss the case.

In the brief filed Monday in US

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