Famed short-seller Jim Chanos is going after American casino operators Las Vegas Sands and Wynn Resorts as the U.S.-China trade war continues.

"One area I'm scratching my head about is the Macau casino guys," Chanos told CNBC's Sara Eisen on Thursday. "We're basically short the U.S. guys ... Wynn and Las Vegas Sands, particularly their Hong Kong-listed Asian operations. In our hedge fund, we're actually long the Chinese operators."

"Whatever your views are on Macau, the U.S. operators trade at a premium to the Chinese operators. While that has always been the case, I think in light of the trade tensions, that doesn't make a lot of sense right now," he said. "At the very least, the U.S. operation should trade at a discount."

Shares of both companies fell to their lows of the day on Chanos' comments, aired on CNBC. Las Vegas Sands closed 0.6 percent lower, and Wynn declined 1.2 percent.