US President-elect Donald Trump has threatened retaliation against governments that challenge the US dollar, vowing "100 percent tariffs" on countries that undercut the US currency.

The Republican vowed the action on states that "create a new BRICS Currency" or otherwise "replace the mighty US dollar," according to a post on Truth Social on Monday.

BRICS refers to a grouping that includes Brazil, Russia, India, China and South Africa, and has expanded in recent years to include Iran, Egypt, Ethiopia and the United Arab Emirates.

Trump's statement, however, comes at a time when the greenback's hegemony does not appear to be facing an immediate threat, having been the world's reserve currency for decades.

The US dollar currently comprises 58 percent of foreign exchange reserves held worldwide, according to the International Monetary Fund (IMF), down from 67 percent in 2000.

But the greenback accounts for 74 percent of export invoices in the Asia-Pacific region, which is the most active in terms of international trade, the IMF says.

The dollar has maintained its unique........

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