WASHINGTON - U.S. President Donald Trump on Tuesday said European Union tariffs facing motorcycle manufacturer Harley Davidson Inc were "unfair" and vowed to reciprocate, but gave no other details.

"So unfair to U.S. We will Reciprocate!" Trump tweeted, citing comments by a Fox Business Network host.

(Reporting by Susan Heavey and Makini Brice) ((202-898-8300; Reuters Messaging: susan.heavey.thomsonreuters.com@reuters.net))