Bangladesh, April 5 -- In a move that has sent shockwaves through global markets and rattled Americas trading partners, US President Donald Trump has declared that his aggressive tariff policy “will never change,” doubling down on what he insists is a path to national prosperity. The sweeping new tariffs, announced earlier this week, have not only unnerved economists and investors, but also ignited retaliatory measures from major world powers and sparked fears of a looming global trade war.

Writing on his Truth Social platform, Trump exuded characteristic confidence. “To the many investors coming into the United States and investing massive amounts of money, my policies will never change,” he wrote. “This is...