And why are the Republicans allowing this to continue?
Unless that was a rhetorical question, they allow it because many so-called "Republicans" are corrupt anti-Trump swamp creatures doing the bidding of their K Street donors.
What is evident here is that if you give to a Republican you will be investigated. If you give to a Democrap all is good. While the Rinos might relish in seeing Trump investigated they are destroying their donor base.
Meuller is way beyond corrupt. The Republican pols are way beyond stupid and also without principle enough to see it.
And why are the Republicans allowing this to continue?
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Why have they allowed all kinds of travesties to happen - like letting the Anwar Brothers get away with spying on the House? They are frightened, spineless, naive, and have their own peccadilloes to hide.