Trump lost a LOT of support on day one when he decided not to pursue charges against ‘crooked Hillary’ as he promised. A lot of failures since then have sprung from that lack of resolve.
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Trump isn’t Attorney General, nor can he order the Attorney General to charge Hillary. So what do you want him to do? He’s repeatedly gone on Twitter and said “Why aren’t you going after the Clintons?” and “Where’s the Justice Department?” (paraphrasing, there). He could fire Jeff Sessions, true, but our USELESS Congress has already told him they won’t accept that and won’t confirm whoever it is that he puts in there to replace him, and they stopped him from firing him and making an interim appointment when they went on one of their frequent vacations.
Trump made the promise. That he can’t fulfill it, regardless of his ability, is his problem.
In fact, he even repudiated his promise by saying that all is good.