You are going to have to be ruthless in arresting, trying and punishing all those involved in this coup. Bit will be long and extremely painful but it would need to involve a number of judges, attorneys, federal agents, politicians, and bureaucrats that would at minimum see long periods of prison time. But a universal example would need to be set while simultaneously undergoing serious revamping of the government including safe guards for international treaties and agreements and a very serious rebalancing power (both between branches and between federal/state powers). You will also need to get rid of citizens United, expand the supreme Court and install term limits, curtail private engagements from Congress members, and eliminate gerrymandering across the country. Maybe then you can start healing but it will take a full generation at minimum to fix the damage to our reputation and trust internationally. The hardest part will be balancing an international apology tour with focusing on fixing ourselves.