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.

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 Donald Trump threatened Mexico wth "escalating consequences," asserting the U.S. ally owes Texas a massive amount of water under a decades-old treaty and is "unfortunately violating their Treaty obligation.