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In an unsigned letter on Tesla letterhead addressed to the U.S.

But in an unsigned letter addressed to the US trade representative, Tesla said while it "supports" fair trade it was concerned US exporters were "exposed to disproportionate impacts" if other countries retaliated to tariffs.

“We hold our employees to the highest standards and expect them to safeguard individuals within our custody,” the department said in an unsigned, emailed statement.

The ruling was short and unsigned, laying out the precedent before requesting clarification from Ali on the administration's "obligations."

The angry exchange meant the deal, that would give the US access to Ukraine's deposits of rare earth minerals, was left unsigned.