The euro initially moved higher early Thursday, after European Central Bank President Mario Draghi revealed the start date for quantitative easing bond purchases. But pressure on the single currency remained.

"A lot of people are short the euro. If the euro pops for the rest of the day, it means to me there's probably a corrective phase," trader Jim Iuorio told CNBC's "Squawk Box," shortly after Draghi said the ECB will begin its monthly $66.3 billion bond purchases next Monday.