Feb 19 (Reuters) - Wall Street's main indexes opened

marginally lower on Wednesday on worries over U.S. President

Donald Trump's latest tariff threats and head of minutes from

the Federal Reserve's January meeting.

The Dow Jones Industrial Average fell 78.2 points, or

0.18%, at the open to 44,478.12. The S&P 500 fell 11.8

points, or 0.19%, at the open to 6,117.76​, while the Nasdaq

Composite dropped 46.8 points, or 0.23%, to 19,994.502

at the opening bell.

(Reporting by Shashwat Chauhan in Bengaluru)