Hillary Clinton warned Monday that presumptive GOP nominee Donald Trump could bankrupt the country like “he’s bankrupted his companies.”

Clinton questioned Trump’s economic policies at the annual Service Employees International Union’s national convention in Detroit.

“He could bankrupt America like he’s bankrupted his companies,” Clinton said, as quoted by The Detroit News. “I mean ask yourself: How could anybody lose money running a casino? Really.”

Trump has filed bankruptcy four times for his companies; three of those bankruptcies involved his casino holdings. He’s argued that the bankruptcies were smart business decisions and said his companies were “tremendous” afterward.