President Donald Trump posted threats against Colombia on his social media platform on Sunday after two U.S. military repatriation flights were prevented from landing.

By declaring he’d put tariffs on goods from the South American country, the president imperiled a growing influx of foreign investment there.

President Donald Trump has repeatedly threatened to dramatically expand tariffs. It’s a move that could affect trillions of dollars in trade and reshape prices for everything from cars to medication — while potentially straining relationships with key U.S. trading partners.