Avoiding the point that the President of the United States feels a matter is urgent enough to speak to the population and two members of Congress suddenly forgot their basic civics lessons and think they are the equal to the POTUS?
Yeah, got that. Not sure you do.
Now, if the networks want to allow the esteemed Senator and Representative to speak in rebuttal, by all means. However, neither Pelosi nor Schumer are in a position to demand anything. They can request and the networks can tell them to piss off, but they are not the equal of the President.
Period.