Trump needs to fire them both — the tortoise and the Weasel.
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There’s a mountain of reasons to fire Rosenstein, and at this point the public would support it, but Trump still will not do it. He let’s this scoundrel do whatever he wants.
Trump’s failure to fire him is sending the WRONG MESSAGE to the rest of the DC Swamp rats. Instead, its time to make an example of him and restore accountability back into the executive branch.
It's not Trump's job to send messages to swamp rats. For one thing 90% of the senior staff is part of the swamp and are not going anywhere (can't be fired, etc). Trump's job is MAGA. In his spare time he can do cleanup if it is low cost.
The only people who need messaging are independent voters who are deceived by the media. Firing Rosenstein doesn't do much for that.