Donald Trump managed to tighten his grip on the GOP nomination by winning key primaries Tuesday, and although he didn’t win Ohio, his proximity to the Oval Office is creating some jitters on Wall Street.

At least one trader is forecasting a stock-market crash if Trump wins the GOP nomination and manages to work his way into the White House.

“If Trump becomes president of this country, the S&P 500 SPX, -1.11% will go to 1,000. People are brushing it off, but there is absolutely no way that this market—and this economy—does not get pounded,” said Ian Winer, head of equity trading at Wedbush Securities in Los Angeles, told the Canadian news outlet BNN in an interview Monday afternoon

“Bad for home builders, bad for everybody, but most of all bad for the United States of America,” said Winer of a Trump election win.

So what’s the outcome bulls should be hoping for?

“People are very concerned in any scenario other than Hillary Clinton at this point, which is shocking in and of itself,” Winer said. “But she seems to be the most market-friendly person that we could have.”

While a Trump win and his “third-grade economics” would negatively impact “pretty much anything commerce-related,” Winer did point to one area that would get a boost: “It’d be great for Canada, because there’s going to be a heckuva lot of people looking to move there permanently,” he said. “Buy Canadian real estate.”

Read:This case for buying Canada and shorting America has nothing to do with Trump.

The host then asked Winer if he would leave the sunny weather of Southern California for the harsh winters of Canada. His answer: “I would pretty much go anywhere but here.”