Semiconductor stocks have had a rough week.
First, news that Action Alerts PLUS holdings Apple Inc. (AAPL - Get Report) was dropping Intel Corp. (INTC - Get Report) as a chip supplier sent the PHLX Semiconductor Sector ETF SOX tumbling 4% Monday.
Four days later, a war of words between the Trump administration and China that could lead to a trade war has sent the ETF down another 0.7%.
The U.S. produced 47% of the global semiconductor in 2016, according to the International Trade Organization. China mainly imports its semiconductors from the U.S., using 58.5% of the global semiconductors produced in 2016, according to PricewaterhouseCoopers.
China imports 80% of the semiconductors in use in the country and the U.S. is the world's biggest semiconductor exporter, so a trade war between the two countries could be hell for semiconductor firms.