The reason that the Republican party is “running interference” against ‘draining the swamp’ is simple: they’re in on the corruption.
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DC is the wealthiest region in the country. The embedded ruling class includes everyone there. Talk about a swamp full of alligators.
The leaks, FBI charade etc. are a very mild indication of the force of the federal bureaucracy coming to bear to bring Trump down. The media is sharpening axes and testing the guillotine.
That's quite true.
Personally, I think that there's enough corruption there that simply "enforcing the law" could bring them down -- after all, the burearchy and elite both think of themselves as untouchable and above the law.