DES MOINES, Iowa (AP) — The former superintendent of Iowa’s largest school district pleaded guilty Thursday, and admitted to falsely claiming to be a U.S. citizen on a federal form and illegally possessing firearms.

Ian Roberts, a native of Guyana in South America, had initially pleaded not guilty to both counts, which together carry a maximum sentence of 20 years in prison, and a trial was scheduled to begin in early March. Roberts affirmed Thursday that he’s aware his guilty pleas could have an impact on his immigration case and that he could face immediate deportation after he serves his sentence.

Roberts ascended as an exuberant and inspiring leader over a two-decade career in urban education. For two years, he was superintendent of the Des Moines public school district, which serves 30,000 students.

Just weeks into a new school year, Roberts was detained by federal immigration officers. The Sept. 26 arrest stunned community members and drew national attention to his history of criminal charges and falsified credentials.

On Thursday, Roberts walked into the courtroom with his wrists and feet cuffed.