Trump said he wants a 50% tax (tariff) on products from Europe starting June 1st. This kind of news can scare investors because it could lead to a trade war between the U.S. and Europe. That means prices could go up, businesses could lose money, and markets might go down.

People say Trump is manipulating the market because when he makes big statements like this, they can cause big moves in prices—even if the policy doesn’t actually happen. Some traders try to profit from these quick moves, so his words alone can shake things up.