XRP got a lawsuit from the SEC and of course that's a problem with the US. Of course the first time is that exchanges that originate in the US or operate there must follow SEC rules or else they could also be threatened. Exchanges outside the US continue to trade XRP because they don't have that problem, but there are also some exchanges outside the US that are also suspending XRP.

There is no problem if the exchange supports XRP or follows SEC rules on current lawsuits. The court is not over yet so take your own risk if you want to trade XRP. I hope XRP wins.