Brookline, Mass., became the 10th and latest local government Thursday to pass a resolution calling for impeachment, a step designed to add pressure on the state’s congressmen to launch a formal investigation that could ultimately lead to the president’s removal from office.

The Massachusetts towns of Cambridge, Amherst, Pelham and Leverett have already made the call, and Newton has a proposal up for consideration.

California is another hotbed of impeachment. The Los Angeles city council in early May overwhelmingly passed a measure asking for impeachment proceedings to begin. Richmond, Alameda and Berkeley did the same.

In Chicago, the city council drafted an ordinance that quickly drew 31 sponsors. Alderman Ameya Pawar, who introduced the resolution, said Trump’s firing of FBI Director James Comey was the tipping point.