There's a new banking supervision plan circulating in Europe, and it is giving finance ministers there a new opportunity for a squabble.
Not surprisingly, the tensions are weighing on the euro.
So does this mean the common currency's run is over?
Hardly, says Kathy Lien, managing director at BK Asset Management. At most, euro weakness right now would be just a bump in the road, she told CNBC's Scott Wapner.