Sales taxes have been proposed and supported as a way to "make the rich pay their fair share". They use the argument that food is excluded, thus it's a progressive tax because poor people have little luxury. Many states and even some cities have sales taxes.
The proponents are, frankly, delusional. It has been shown that people with higher incomes save more; unless you want to charge sales tax on capital gains or on mutual funds and savings accounts, there is a large chunk of money not being spent on sales-and-use. That means, for all intents and purposes, those of us sacking hundreds of thousands away, the Warren Buffets, the Donald Trumps, the people who put 60% of their money into savings, from middle-class up to ultra-rich, we all get to avoid much more of our taxes.
They say, "Well, the rich can't hide their money over seas, because a sales tax applies on everything!" How does it apply to the $32 trillion bank accounts hidden over seas?
So, no, the Federal Government doesn't have sales tax; but some idiots have proposed it.