The state of Texas is backing a school that expelled a black student after she refused to stand for the flag during the US Pledge of Allegiance.
Texas Attorney General Ken Paxton intervened on Tuesday to defend the Houston-area school district in its lawsuit with the student, India Landry.
Ms Landry, 18, filed a lawsuit after she was expelled last year from Windfern High School.
The case comes amid political tensions over respect for the American flag.
“School children cannot unilaterally refuse to participate in the pledge,” Mr Paxton – the state’s most senior law enforcement officer – said in a news release.