Boston Mayor Michele Wu said she's ready to testify before a congressional panel​ on Wednesday despite Republican lawmakers already pushing out videos that indicate questions will have an aggressive tone.

When Mayor Wu goes to Washington, D.C, to defend Boston's status as a "sanctuary city," she will be articulating a moral argument, not a political one, argues one letter writer.

Wu has won their backing after successful contract negotiations. The endorsement comes as the mayor prepares to testify in Washington over what Republican legislators call the city's "sanctuary" policies.