President Donald Trump sent markets lower Friday with a tariff warning for China. By Sunday night, the president reversed course and stocks are soaring on Monday. A market expert breaks down what the warning means for the markets.

<p>President Donald Trump sent markets lower Friday with a tariff warning for China. By Sunday night, the president reversed course and stocks are soaring on Monday. A market expert breaks down what the warning means for the markets.</p>

特朗普對中國：市場專家稱，最新的關税威脅帶來了新的 ‘不確定性水平’