Well, if your questional is vague, then so will my answer be. Constitutionally/legally.
And you know that you cant possibly argue that he has the right to remain in that room while violating everyone elses right to observe the ceremony in peace ..
And if you think you can support that protestor then you obviously stand in support of the Code Pink protestors who attempted to disrupt Sarah Palins V.P. nomination speech by rushing the stage in Minnesota back in 2008 ..