President Donald Trump announced today that he approved a petroleum pipeline that would go right "under the wall" to Mexico as part of his administration's goal of U.S. energy "dominance."

At the Unleashing American Energy Event on Thursday, Trump said the pipeline would "further boost American energy exports."

The new pipeline from Texas to Mexico won't be transporting oil, however. Built by NuStar Logistics, the pipeline would transport petroleum and natural gas to and from its terminal in Reynosa, Tamaulipas, Mexico.

The 10-inch diameter New Burgos Pipeline will run parallel to the existing 8-inch pipeline. The new pipeline will transport the equivalent of 108,000 barrels per day.

To be sure, export of natural gas to Mexico is not a new trend. The trend started gaining momentum in 2010 and is part of that country's plan to reduce the use of coal to produce power.

Mexico has increasingly been importing cheap U.S. natural gas after opening parts of its energy sector to foreign investment. U.S. natural gas pipeline exports to Mexico have nearly doubled since the start of 2015, according to the U.S. Energy Information Agency.

U.S. natural gas exports to Mexico have helped the country ease its reliance on fuel oil and coal for electricity. A January report from the EIA said the Mexican government is projecting that natural gas will replace more than 15.9 gigawatts of capacity, most of that from old oil and coal plants by 2029.

In his Thursday speech, Trump talked about "clean, beautiful coal," referring to his promise to revive the U.S. coal industry, which has been in a state of decline as cheap natural gas replaced coal as the fuel of choice to produce electricity — just as the pipeline would help Mexico do.

Trump pointed to a Corsa Coal plant opening in Pennsylvania, easing restrictions on coal leasing on federal land and lowering barriers to exporting coal to the Ukraine.

The new coal plant is mining primarily for overseas steel production rather than domestic power consumption.

"There are many other places that need it, too," Trump said. "And we want to sell it to them and to everyone else all over the globe who need it."