In 2016, the U.S. imported about $23 billion in agricultural products from Mexico, duty-free.
Tens of thousands of people marching for climate action Saturday faced record-high temperatures.
The agency said it's to get the website more lined up with the current administration.
The main march in Washington, D.C., starts at the U.S. Capitol and is slated to travel to the White House and the Washington Monument.
The launch came a day after President Trump said there's a chance of a "major conflict" with North Korea.