Democratic House legislators on Friday introduced a bill that would provide a $ 4,500 tax bill to buyers of electric vehicles connected to U.S. institutions and the union.
Musk wrote on Twitter on Sunday that the bill was drafted by Ford Motorists and United Auto Workers.
"This was written by Ford / UAW car enthusiasts, as they make their electric car in Mexico. It's unclear how this will cost American taxpayers," said billionaire Tesla, in connection with the Bloomberg case on the production of Ford's Mexang Mach-E plant in Mexico.
The $ 4,500 incentive could provide an opportunity for U.S. car manufacturers such as GM, Ford and Chrysler, while Tesla - who was historically opposed to the federation - could lose out.
Musk did not give evidence of being recruited by Ford and UAW. An UAW spokesman did not respond to Musk's comments when asked by Insider, but highlighted a statement from UAW President Ray Curry recommending the bill.
Ford did not immediately respond to Insider's request for comment.
The bill also provides a $ 7,500 consumer incentive for new EVs sold in the US, and will allow imported cars to claim that incentive for five years. This arrangement will apply to Ford vehicles assembled in Mexico.
In a follow-up tweet in response to a Twitter user who said President Joe Biden should make American-made cars a priority, Musk said "ahem" and entered the official account of the President.
There were already signs of a rift between Tesla and Biden's management over a company opposed to the union. Biden hosted an American electric car event in August - Tesla was not present. Musk wrote on Twitter at the time that "it is strange that Tesla was not invited."
Foreign companies that do not have US unions will also lose out under this amount. Toyota and Honda also opposed the bill in a statement on Saturday, Reuters reported. Toyota claims the bill discriminates against "American workers who work independently because of their decision not to include them."
The bill is expected to be voted on by the House Ways and Means Committee on Tuesday, Reuters reported.