Australia is suing a Chinese-linked company and a former associate over a breach of foreign investment laws linked with rare earths miner Northern Minerals , the national treasurer said on Thursday, adding it was the first case of its kind.

Donald Trump has said the US and China had signed a trade agreement in what appeared to be another attempt to get Beijing to commit to end China’s export restrictions on rare earth minerals, which have roiled America’s advanced supply chains.

President Donald Trump said Thursday that a deal had been signed “yesterday” with China, but offered no details.