On Wednesday, Attorney General Jeff Sessions is scheduled to appear before the California Peace Officers’ Association in Sacramento to make a “major” announcement about Sanctuary Cities.

Mercury News reports:

Sessions will make the “major sanctuary jurisdiction” announcement at the 26th Annual Law Enforcement Legislative Day, according to a news release from the Department of Justice. The announcement comes after Oakland Mayor Libby Schaaf warned residents of an imminent raid by federal immigration agents last week that led to the ICE director saying the mayor tipped off criminals. The White House and ICE Director Thomas Homan also announced that the Department of Justice would launch a “review” of the mayor’s actions. A department spokesperson declined to comment when asked this week whether a probe was underway.

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News of the announcement follows the Justice Department issuing a “final warning,” to various sanctuary cities around the country. Cook County, Illinois, Chicago, Illinois, New Orleans, Louisiana, New York, New York and Philadelphia, Pennsylvania are on the Justice Department’s hit list for failing to enforce federal immigration laws.

The cities had until October 27th to provide additional evidence that the interpretation and application of their laws, policies, or practices comply with the statute.