Answer: His argument was against Tinker, or the students who were protesting.
Explanation: His main point was that although the 1st amendment applies to all people, it does not apply all the time. He believed that in the school environment, because the armbands distracted students from their work and prevented school officials from performing their duties, the 1st amendment did not apply to them- therefore they did not have the right to openly express their opinions at that time.