America’s top finance chiefs are on high alert for a recession. For the first time in several years, economic uncertainty is now their lead concern, replacing worries about the difficulty of hiring and retaining talented workers.

Fifty-three percent of chief financial officers expect the United States to enter a recession prior to the 2020 presidential election, according to the Duke University/CFO Global Business Outlook survey released on Wednesday. And two-thirds predict a downturn by the end of next year.