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The FBI executed search warrants at the home and offices of Los Angeles Unified School District Superintendent Alberto Carvalho Wednesday.

Carvalho has led the nation’s second largest school district since February 2022. He previously served 14 years as superintendent of the Miami-Dade County School District in Florida. Carvalho has been an outspoken defender of undocumented students and at one point was an unauthorized immigrant himself.

“We have been informed of law enforcement activity at Los Angeles Unified School District headquarters and at the home of the Superintendent,” a district spokesperson said in a statement. “The District is cooperating with the investigation and we do not have further information at this time.”

Here’s what we know so far:

Under Carvalho’s leadership, Los Angeles Unified School District has ramped up protections for undocumented students in response to the Trump administration’s aggressive immigration enforcement tactics. The district has expanded bus routes and virtual schooling options, conducted its own patrols around school sites, and helped families with legal assistance. Carvalho grew up very poor in Portugal and was homeless and undocumented as a young man. He has said his own experiences mean he can understand the fear that many immigrant students feel today.The School Superintendents Association named Carvalho their Superintendent of the Year in 2014 when he was the head of the Miami school district, the nation’s fourth-largest. In 2018, then-New York City Mayor Bill de Blasio named Carvalho chancellor, only for Carvalho to turn down the job. He took the top job in Los Angeles in 2022.The Miami district’s inspector general investigated a nonprofit started by Carvalho for soliciting a donation from a company that created a failed online learning platform. The investigation found no ‘actual’ wrongdoing, the Miami Herald reported in 2021, but the inspector general said the donation created an appearance of impropriety and should be returned.

Editor’s Note: This story has been updated with additional information about LAUSD’s AI chatbot for students. This is a developing story and could be updated again.

Erica Meltzer is Chalkbeat’s national editor covering education policy and politics. Contact Erica at emeltzer@chalkbeat.org.