Because that worked so well with Mexico paying for Trump's wall:
Walker voted last week for the unprecedented relief package, known as the CARES Act. The legislation’s scope includes direct one-time payments to Americans, financial assistance to struggling businesses, larger unemployment benefits and aid to health care providers.
Before the vote last week, Walker tweeted that he wants the U.S. government to pass along the costs to their Chinese counterparts. “China’s lack of transparency created this. Now we are asking American taxpayers to foot the bill?” wrote Walker in his tweet.
Even if we hadn't been in a complex and unnecessary trade war with China for the last year or more this would be a stupid idea. But with that in the picture, it's both moronic and delusional. Trump has pissed away any leverage we might have had to push such a policy, and we'd be lucky if China merely laughed at us for making such a demand. They actually hold over $1 Trillion in U.S. debt, and if they decided to sell those Treasury bonds off, it could cost us much more than just a Trillion: