That could happen pretty quickly. The new administration could announce a total review of ALL regulations on Constitutional and on economic grounds.
• The review would be undertaken by newly appointed boards within each agency.
• Promulgation of all new regulations would cease.
• The current regulation-writers would be tasked with new, unrelated but very menial responsibilities (realizing government unions would frown on mass firings)
• If new regulation-writers are needed, they would be hired from outside the government.
• A bill would be submitted rescinding the ability of extremist interest groups to bring lawsuits on behalf of plants, animals and other non-human parties.
This, I think, is the lesson from the Obama administration.
Few people realized just how much can be done by the Executive Branch via its control of all the bureaucratic minions in the agencies and departments. Replace them from the top down until you get to the level of 9-5ers with no vested interest in how things have always been done and who are gung-ho to get a promotion and do it your way.
Regulations that were devised and issued by agencies can be eliminated or rewritten by those same agencies under new management. Those that are not in the spirit of the laws passed by Congress can be struck down. Those that favor particular persons, groups or businesses either by name or by virtue of them being inapplicable to anyone else should be struck down. Many regulations were lobbied for by one business leader to create barriers to entry against competitors — making the only “legal” way to do something the way the lobbyist’s client already does it.
If I were Trump, I would appeal to the greed of the bureaucrats. Offer bonuses for identifying regulations that conflict with the laws actually passed by Congress or that were obviously written to favor particular actors. Same for cost-savings. I call it the “Dog-Eat-Dog Rule” after Atlas Shrugs but with an entirely different meaning. Offer government employees bonuses and raises based on ACTUAL cost savings — including reduced staff and cheaper vendors — and watch them cut each others’ throats.