Mexican President Andres Manuel Lopez Obrador reiterated on Sunday the need for oil independence as his government said it would tender six construction contracts in June for a planned oil refinery in the southern state of Tabasco. Tensions between Mexico and the United States have been running high in recent days after President Donald Trump threatened to impose punitive tariffs on Mexican goods unless Mexico halts a surge in illegal migration. "We, our children and grandchildren aspire to live in a free, independent, sovereign country and we do not want to be a colony of any foreign count...