Lawyers for Mahmoud Khalil, the Columbia University graduate and Palestinian activist who was detained by the Trump administration for months, have filed a claim for $20m in damages against the administration, alleging Khalil was falsely imprisoned, maliciously prosecuted and smeared as an antisemite as the government sought to deport him over his prominent role in campus protests.

The filing – a precursor to a lawsuit under the Federal Tort Claims Act – names the Department of Homeland Security, US Immigration and Customs Enforcement and the state department.

Khalil, 30, was released from US immigration detention last month after having been held for more than three months over his activism against Israel’s war on Gaza. He has become the most high-profile of the students who have been arrested by the Trump administration for their pro-Palestinian activism.