He promised a special prosecutor. His AG should appoint an honest one, and let him/her do the job without interference one way or another.
Too much for a single person. This thing has tentacles and the tentacles have tentacles. We need a huge team. One team just to prioritize which people get prosecuted first.
Trump would insert himself into the process for no good reason and Special Prosecutors have been disastrous wild cards in the past because Special Prosecutors are also independent prosecutors and nobody in government can be trusted to be independent and unaccountable for a wide range of reasons.
They have also been targets for politicization, intimidation and bribes.
All Trump needs to do is to instruct the DOJ, Dept of State and IRS to stop obstructing justice , covering up and stonewalling and cooperate 100% with the many FBI, IRS and Congressional investigations of the clintons and the Clinton Foundation.
He should also make sure the FBI investigating team is purged of all Clinton ringers obstructing the investigation from within the FBI, including Comey if necessary
Let the Congressional Oversight make any new FBI referrals
Remember, the duty of the Congressional Oversight Committees is not to prosecute - it is provide accountability so any pardons will actually simplify and expedite their investigations.