I believe it's not even technically a flag but a banner.
Notice it's held in place by an horizontal pole/pipe.
Podium banner:
That's why he's not flying it like his other flag.
I don't get why people are offended by that "flag".
If anything else they should be proud of the freedom offered under the US constitution to freely display any flag you want.
I could get arrested if I display that flag in France, or in many other countries where owning it is even illegal.
If that's truelly an original historical piece I wouldn't have displayed outside just because it will dammage the fabric.
It is a paradox how a man from western Europe has a far better understanding of the principles of our First Amendment than all these American SJW retards running around with "HATE SPEECH IS NOT FREE SPEECH" signs.