Britain's referendum on its membership in the European Union isn't just a threat to the pound.
While the pound led declines among major currencies on Monday with its biggest slide since 2010, the euro had the second-largest decline, weighed down by signs of slowing growth.
"If we have increased Brexit risk, we will have a negative risk for the euro," said Daragh Maher, New-York-based head of U.S. currency strategy at HSBC Holdings Plc, Europe's biggest bank.
Draghi has already pledged more than a trillion euros in asset purchases and cut policy interest rates below zero in an attempt to boost inflation, and the prospect of more stimulus at next month's meeting is further weakening the euro.
