With new federal restrictions eliminating $29 million for permanent housing projects for people overcoming homelessness in Boston, the city has joined a federal lawsuit to stop the Trump administration’s “unlawful and unreasonable restrictions on funding,” according to a statement from Mayor Michelle Wu’s office.

The funding cut from the US Department of Housing and Urban Development threatens proven solutions to homelessness and could push as many as 1,100 people back into homelessness, the statement said.

The city of Cambridge also signed onto the lawsuit, which comes a week after Massachusetts Attorney General Andrea Campbell and a coalition of 20 states filed a similar legal action in Rhode Island.

That suit included every New England state except New Hampshire. It accuses HUD of c

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