Here's what McConnell actually said:
“I look forward to welcoming President Zelenskyy to the Capitol and to hearing from the Ukrainian people’s elected leader at a critical moment in their struggle for their safety and sovereignty against Russia’s unhinged aggression,” McConnell said.
Obviously never used the word "demands", which was added by whomever wrote that article just to piss people off, and of course it succeeded.
Zelensky has no power to "demand" anything from us. I'm sure he will ask us for certain support, and make the best case he can for why he believes it is in the US national interest to continue supporting Ukraine. I'm sure Ben Franklin made many similar requests to the French and Spanish during our Revolution. People are free to agree or disagree with what he's saying, and then it will be up to us to decide the extent to which we fulfill -or don't fulfill - those requests.
But the use of the word "demands" was just a transparent in attempt to shape a particular narrative.
“Russia’s Unhinged aggression”
This is Joe’s Vietnam. Wake up everyone before the nukes start flying.