This comes as at least one Sanders delegate is saying his credentials were stripped from him after he held a protest sign during President Obama’s speech Wednesday night.

Frank Klein: “I’m Frank Klein. I’m a 61-year-old delegate from Arkansas Congressional District 4. I’m here to represent my—I’m a Bernie delegate. They had told me, because I held up a “No TPP” sign during the Obama speech—I didn’t yell, I didn’t make a commotion, I just held up a sign—that it’s against DNC rules for me to use an unofficial sign, and they refused to give me my credentials to go to the convention on the fourth day. I feel like this is a violation of my constitutional rights to free speech.”