Tariffs are Trump's weapon of choice in on-again, off-again trade wars with Colombia, Canada, Mexico, China, importers of cars, importers of steel and aluminum

Long-threatened tariffs from U.S. President Donald Trump have plunged the country into a trade war abroad — all while on-again, off-again new levies continue to escalate uncertainty.

Few can question the fact that the proposed Trump tariffs have rattled investors. Such levies increase the cost of doing business. Hence, with the uncertainty surrounding when tariffs will be implemented or how much they will cost businesses and consumers, most stocks have fallen in recent trading sessions.