Fannie Mae-No Politics (FNMA)

[Robert from yahoo bd]

I'm not really sure about the limits of Congress's ability to try to influence, intimidate, and attempt to control the Judiciary Branch. Maybe a coincidence, but right this second the SCOTUS could theoretically be OVERTURNING Humphreys Executor, a decision many observers have said was influenced by FDR's court packing threat.

Could the Congress reduce the Justices salary to $1 if they don't like one or more of their opinions? Is there a sharp line of exactly what the Congress can and can't do and has it been tested in the roughly 250 years of American Democracy?

I thought Barr always exerted some independence from DJT and that pissed the POTUS off, but how insulated is DOJ from the Congress?