The US is investigating whether Huawei accessed advanced American chip technology via TSMC, despite a ban on such sales.

Taiwan Semiconductor Manufacturing Co. is planning more plants in Europe with a focus on the market for artificial intelligence chips, according to a senior Taiwanese official, as the chipmaker expands its global footprint.

But TSMC promptly issued a statement today, defending itself as "a law-abiding company" that's "committed to complying with laws and regulations, including export controls." For the past four years, the US has considered Huawei a national security risk after Huawei allegedly provided financial services to Iran,