Once they print up the money and stick it in the market, there isnt anything you can do.
Its like saying, "Once I jump off a cliff, how do I get it repealed?"
I imagine that any taxpayer can file a lawsuit to do so, since the Fed/Treasury is taking the money from the taxpayer. As to how to challenge it, I suggest starting with the Constitution, Article I Section 7, where it says that "All bills for raising Revenue shall originate in the House of Representatives" - that, obviously, didn't happen - the Senate voted first!!!![]()