At an all-day hearing on sanctuary cities held by the U.S. House Oversight Committee, Republican lawmakers were intent on vilifying the Democratic mayors of Chicago, Boston, and other cities and accusing them of allowing undocumented immigrants to run rampant by refusing to authorize local police forces to work with the federal government on immigration enforcement.

But the narrative of dangerous immigrants and crime-ridden Democratic-led cities did not sit well with the local leaders who voluntarily testified before the committee, and Democratic Boston Mayor Michelle Wu appeared to welcome the opportunity to set the record straight regarding immigration reform and the broader GOP agenda.

Rep. Paul Gosar (R-Ariz.) accused Wu of acting unconstitutionally by setting immigration statutes in Boston that differ from federal policies under the Trump administration, which has launched a nationwide deportation operation led by border czar Thomas Homan and Immigration and Customs Enforcement (ICE).

As a sanctuary city, Boston does not fully cooperate with ICE to arrest undocumented immigrants, but Wu noted in the hearing that under a local law called the Trust Act, authorities work with the agency “every single day on criminal matters and hold people who are committing crimes accountable.”

When Gosar demanded to know whether Wu defers to local, state, or federal laws when there is a distinction in immigration-related policies, the mayor pointed out that local leaders are not required to follow federal law “in conflict with local laws or state laws.”

“The federal government has jurisdiction and supremacy over all immigration laws,” replied Gosar. “We’re the ones that define that. We just heard, ‘We want comprehensive immigration policy.’ How can you get a comprehensive immigration policy when you’re defying it from the get-go?”

Wu answered that Congress could pass “bipartisan legislation, and that would be comprehensive immigration law.”

“The false narrative is that immigrants in general are criminals or immigrants in general cause all sorts of danger and harm. That is actually what is undermining safety in our communities,” she said, adding that Republicans could end their efforts to cut Medicaid and health research, and pass broadly popular gun control legislation.

“That is what would make our city safe,” said Wu.

Wu further suggested she won’t be pressured into changing her city’s immigration policies to match President Donald Trump’s when she said Boston has not historically been governed by “the word of presidents, or kings, or presidents who think they are kings.”

The mayor fiercely defended her record as the city’s leader and spoke out against characterizations of Boston and other large cities as crime-ridden, noting that officials recorded the lowest number of homicides in Boston last year since at least 1957.

She called on Homan to testify on Capitol Hill after Ranking Member Rep. Gerry Connolly (D-Va.) pointed to the border czar’s comments from last month about Boston. Without citing specifics, Homan accused Massachusetts authorities of allowing “multiple” violent criminals who were unauthorized to be in the U.S. to walk free from jails.

“Shame on him for lying about my city, for having the nerve to insult our police commissioner who has overseen the safest Boston has been in anyone’s lifetime,” said Wu.

In Boston, city councilors and advocacy groups led local residents in a rally supporting Wu and the city’s immigrant community. Attendees held signs that read, “Stay the hell out of Boston, Homan” and chanted, “Say it loud, say it clear, immigrants are welcome here!”

From Washington, Wu sent home a message via social media: “To every one of my neighbors back in Boston, know this: You belong here. This is your home. Boston es tu hogar. Boston se lakay ou… This is our city. We are the safest major city in the nation because we are safe for everyone.”