Nothing, for several reasons:
1. You are not involved in any real "Resistance!" which is typically defined as "An underground organization engaged in a struggle for national liberation in a country under military or totalitarian occupation."
Any American citizen who claims to be a member of "The Resistance" in opposition to the currently elected Administration is no more than a whining sore loser, trying to cloak themselves as "freedom fighters."
The problem with that is...you already live in a free country, literally just about the "Freest" in the world. There are no Gestapo or KGB, informers, or storm-troopers here; no military patrols in our streets oppressing you.
We don't even have laws like Canada's Bill C-16 which punish criminally for non-violent Free speech.
2. The President did both Mr. Ball and the other parents a personal service, one he did not have to do...since the kids had violated the criminal laws of a sovereign nation and like any other foreigner who breaks the law of the nation they visit (including here in the USA) they are subject to the criminal justice system of that nation. In this case, up to ten years in prison.
https://newsone.com/3757629/china-shoplifting-laws-liangelo-ball-arrested-punishment/
The President could simply have followed international law, and left the boys to the mercies of China's criminal justice system. Where, btw, a defendant is presumed GUILTY until proven innocent.
Mr. Ball should have been appropriately thankful, and IMO his poor example is typical of the selfish, self-centered rudeness of many of our most recent generation of "adults."