According to Reuters, according to him, this can happen if Mexico does not stop the flow of drugs in the United States.
He also threatened to introduce duties on Mexican goods.
Earlier, Trump said he would close the border with Mexico or most of it next week if the country does not completely stop the flow of illegal migrants to the United States.
It was also reported that US Homeland Security Secretary Kirsten Nielsen instructed to speed up the deployment of additional forces along areas of the country's southern border.