Huawei Technologies Co. and wireless carrier SoftBank Group Corp.’ close business dealings could be an issue in T-Mobile U.S. Inc.’s proposed purchase of SoftBank’s Sprint Corp.

Elon Musk will likely need clearance from U.S. national security officials for any proposal to take Tesla Inc. private with financing from Saudi Arabia, just as the Trump administration steps up scrutiny of foreign investment in American technology. The deal, if it becomes reality, would ...

With his swift rejection of Broadcom Ltd.'s hostile takeover of Qualcomm Inc., U.S. President Donald Trump sent a clear signal to overseas investors: Any deal that could give China an edge in critical technology will be swatted down in the name of national security. Although ...