The arrest of a US army veteran who protested against the Trump administration’s immigration crackdown has raised alarms among legal experts and fellow veterans familiar with his service in Afghanistan.

Bajun Mavalwalla II – a former army sergeant who survived a roadside bomb blast on a special operations mission in Afghanistan – was charged in July with “conspiracy to impede or injure officers” after joining a demonstration against federal Immigration and Customs Enforcement (Ice) in Spokane, Washington.

Legal experts say the case marks an escalation in the administration’s attacks on first amendment rights. Afghanistan war veterans who know him say the case against Mavalwalla appears unjust.