Actually I think it is. They have a new show on they've been advertising for weeks. Mind you I'm not going to watch it but I'm sure the advertisers that spent dollars on that advertising aren't going to be very happy about it. As NBC is a private company, do they have some duty to carry impromptu (less than a week is a moment's notice) speeches by politicians or are they in business to make money and provide a product for those watching?
It's an FCC law, the President can demand air time. It just depends if the oval office is making this a demand as to whether the alphabet soup networks have to cover it.
During Bubb-a-tep's tyranny in the whitehouse. I bet air time never needed to be demanded...the network would gladly show their poster child.
Besides, NBC wouldn't do well under the Taliban.