President Donald Trump renewed his war of words with iconic U.S. motorcycle maker Harley Davidson on Sunday, denouncing the company's plan to shift some production abroad and appearing to back consumers that have called for a boycott.

In a series of early morning posts on Twitter, the president said that people looking to stop buying Harleys was a "great" development, adding that other companies were moving to produce in America.

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Harley is increasingly investing in production facilities overseas to avoid tariffs. The 115-year old motorcycle manufacturer has been caught in a public relations firestorm since June, when it announced plans in June to move its European market production out of the U.S. because of retaliatory tariffs from the European Union.

Harley's international plans include making inroads in India and China, as its U.S. sales have tailed off amid a lack of millennial buyers. Total global sales from motorcycle exports totaled $24.1 billion in 2017, according to data from World Top's Exports, with Asian countries accounting for the largest share of exported bikes. European exporters came in second, those figures showed.