Is free tuition possible at U.S. schools?

From Germany Just Made College Tuition Free? Why Won't Our Black Political Class Fight For Free Tuition Here?

Is free tuition even possible?

Of course it is. It's not just possible, free tuition at the nation's public colleges and universities would actually cost LESS than the federal government now pays to those institutions, according Department of Education stats quoted in two very useful articles by Jordan Weismann in The Atlantic in 2013 and 2014. Public colleges and universities, he points out, account for 75% of college grads while sub-prime for-profit colleges, which are basically machines capture low-income students and walk them through applications for subsidized guaranteed loans account for a tiny percentage of grads but eat a full quarter of all the federal aid dollars.