Panama's President Jose Raul Mulino responded "be serious, be serious" on Wednesday when asked in Davos whether he was concerned the U.S. would invade after President Donald Trump said he would take back the Panama Canal.

The Panama Canal “was not a gift” from the US, Panama’s President Jose Raul Mulino said on Wednesday in response to Trump’s threat to seize control of the strategic waterway. Beijing, meanwhile, rejected the US president’s assertion that it is effectively in control of the canal.

In recent weeks, when he was President-elect Donald Trump publicly said that Panama should return the Panama Canal to the United States, and he would not rule out using military force to reclaim it. At his presidential Inauguration on Monday Trump doubled down on saying that his new administration was going to take back the canal.