Mayor Michelle Wu “expects to pay” up to $650,000 to prepare for tomorrow’s congressional hearing on sanctuary cities, the mayor’s office told the Herald.

“The prep sessions included staff from the Mayor’s Office, Law Department, Boston Police and other senior advisors and leaders from the Cabinet, as well as an external law firm, Cahill Gordon & Reindel,” Wu’s office said.

The office added: “The City retained Cahill for a rate of $950/hour and expects to pay the firm up to $650,000 for legal work related to the March 5 hearing, committee investigation, and production of related documents.”

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The Herald inquired about any cost associated with tomorrow’s hearing Monday and was not informed of the $650,000 bill until today.

This is a developing story …