We know what Trump would like to do with that power, because he's said so out loud. He is driven by self-interest and revenge, in that order. He wants to squelch the criminal charges now pending against him, and he wants to redeploy federal prosecutors against his enemies, beginning with President Joe Biden. The important question is how much of that agenda he could actually carry out in a second term.
The whole second volume of Special Counsel Robert Mueller's report, which documented 10 occasions on which Trump tried to obstruct justice, can be read as a compilation of thwarted directives.
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