Can someone explain the partisan calculus behind this?
The GOP is going to Reid-Rule him in, and if Trump can pick another justice, they'll do it again.
I'm assuming, then, this is just for perceived political advantage for use during individual 2018 races?
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A line in the sand. McConnell will cross it, and the Senate will be changed forever. The Nuclear Action is an attack on democracy itself, and one more nail in the coffin following the conservative plan to create a Plutocracy in America.
This statement ^^^ will be too abstract for most of Trump's supporters, and for those who actually believe conservatives and Republicans can actually govern, and will morally and honestly represent all of our citizens.
They will not, it is not in their best interests, and as everyone knows but few admit, a member of Congress' first priority is their own job, not yours.