Yes, governments can do all that, and more. But those are the hallmarks of an increasingly desperate and tyrannical form of government. Trust in government is already at historically low levels and those kinds of actions would probably be extremely counterproductive in that it would be an overt admission that the markets, currency, and economy has only one direction - down, and would also serve to accelerate capital flight out of the country.
There might not be anyplace "safe" overseas to put said money and capitol.
Think about it - if he worldwide economy has melted down, and the G20 meet in Geneva to talk about "emergency measures" that would definitely include talks about moving towards a single global currency (and that will happen), then don't you think they will all collaborate in order to prevent capitol and wealth from flowing out of one country and into another?
Answer: of course they would! They would have to.
You are assuming that this administration does not want to destroy the country.
Check your premise.
Please, I beg of you, provide any example you can that indicates you are correct, that this administration wants the country to succeed.