Hopefully you do not think the Fed literally prints money to add to the money supply. Money is not what the banks deal with— it is credit. The Fed used its assets and its purchasing power to expand credit. It worked— or Trump would be experiencing huge inflation now and a struggling economy. It never happened. The Fed did a good job with only the monitory policy part of the economy—not the jobs, stock market, and government budget parts. There was no inflation like some people said woud happen. In fact, Trump gave strong consideration to picking Janet Yellen for another term as Chair of the Fed. Trump plans to continue to expand the deficit by trillions for several years until the government collects more taxes and it can be paid off— see how that goes.