Donald Trump has targeted Huawei, which overtook Apple to become the world’s second-largest handset maker in mid-2018. The US ban on Huawei saw many US companies restrict their supply of goods and services to the Chinese giant. Huawei’s latest Mate 30 Pro smartphone runs on Android. However, to encourage consumers to switch to Apple and Samsung, it doesn’t support Google services such as Gmail, Google Play Store, or YouTube.

Samsung (SSNLF) is currently Apple’s biggest threat. Apple, which assembles its iPhones in China, faces a 15% tariff on Chinese imports. The tariffs could either increase iPhone prices or reduce Apple’s margins, depending on who bears the tariff burden. Meanwhile, Samsung faces no tariffs and offers a 5G modem and a new foldable-screen phone.

Apple’s stock rally could fade if the December 15 tariffs come into effect. That day could also bring another stock market crash, with Apple being the hardest hit. However, if Tim Cook convinces Trump to exempt Apple products from the tariffs, the tables could turn.