regardless of what someone does or does not so

epistolario

Senior Member
Tagalog
I came across this sentence online:

But Pelosi sounded defiant, telling the AP that Trump was “impeached forever” regardless of what the Senate does or does not so. (New York Post)​

What is the purpose of the last word so in that sentence?

Please confirm if these modifications are also possible without changing the meaning of the original sentence:

a) ... regardless of what the Senate does or does not.​
b) ... regardless of what the Senate does.​
 
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