Details of President Trump's "gold card" visa program are still being finalized, but the proceeds are already earmarked to help tackle America's national debt burden.

U.S. President Donald Trump on Wednesday said his proposed $5 million "gold card" visa would help the country pay down its debt while offering top companies a way to attract top immigrant workers.

Foreigners have been able to invest to obtain citizenship in some countries on the continent for years, but governments are increasingly changing course.