Popular online shopping meccas Temu and Shein have warned of potential price hikes due to Trump's tariffs.Temu, a China-based e-commerce platform, is popular for affordable cross-border purchases.Shein, known for inexpensive fashion, moved its headquarters to Singapore but still manufactures most products in China.The US-China trade war has led to spiking tariffs, with China now facing tariffs of up to 245 percent.