What's the record for prosecutions under an administration? Trump's surely going for The Most Criminal White House Administration Ever. And let's remember that a lot of the prosecutions of Bush II and Reagan cronies occurred after their terms were over. Donnie Johnny could get his century before the drinks break!
Well, lets enumerate shall we... in no particular order
1. Paul Manafort - Trump’s former campaign chairman;
1 count Defrauding the US
1 count Conspiracy to commit money laundering
1 count Obstruction justice (witness tampering)
1 count Conspiracy to obstruct justice
5 counts Tax fraud
4 counts Bank fraud
5 counts Conspiracy to commit bank fraud
1 count Failing to disclose a foreign bank account
1 count Being an unregistered agent of a foreign principal
1 count Making false and misleading FARA statements
1 count Making false false statements to the FBI:
Guilty on all counts
2. George Papadopoulos: Trump's Campaign Advisor
1 count Making false statements to the FBI (Relating to contacts he had with agents of the Russian government while working for the Trump campaign)
Guilty
3. Michael Cohen: Trump's Lawyer
5 counts Tax evasion
1 count Financial Fraud (making false statements to a financial institution)
1 count Wilfully causing an unlawful corporate contribution to a political campaign
1 count Making an excessive campaign contribution at the request of a candidate.
Guilty on all counts
4. Michael Flynn: Trump's National Security Adviser
1 count Making false statements to the FBI (wrt this discussions with the Russian ambassador)
Guilty
5. Rick Gates: Trump's campaign adviser
1 count Making false statements to the FBI
1 count Conspiracy against the United States
Guilty on both counts
And we're only half way though his term, and there are likely a lot more people close to Trump in the firing line including Donald Trump Jr and Jared Kushner
ETA:
"I surround myself with the best people. I know the best people."
- Donald J. Trump, November 26, 1999)