President Trump said in a social media post that he would impose tariffs and sanctions on Mexico if it does not comply with a treaty from 1944 to provide water to South Texas.

President Trump threatened Mexico with more tariffs and sanctions on Thursday over a water dispute at the southern border. What he's saying: "Mexico OWES Texas 1.3 million acre-feet of water under the 1944 Water Treaty,

U.S. President Donald Trump on Thursday threatened Mexico with sanctions and tariffs in a dispute over an 81-year-old water treaty that outlines water sharing between the two countries through a network of interconnected dams and reservoirs.