Story highlights Interior Secretary Ryan Zinke also announced $7.2 million in funding for a battlefield grant program

Trump had promised that, if elected, he would donate his White House salary to a worthy cause

(CNN) The $78,333.32 that President Donald Trump donated from his first paycheck as President will help fund restoration projects at Antietam National Battlefield.

I'm honored to announce $185,000 in funds to match @POTUS salary which together will restore Antietam historic sites pic.twitter.com/VO36gdSzaP — Secretary Ryan Zinke (@SecretaryZinke) July 5, 2017

On the campaign trail, Trump promised that, if elected, he would donate his White House salary to a worthy cause. Under existing federal law, the President is required to accept the $400,000 salary that comes with the office.

The April decision to donate the first three months of Trump's salary was announced at a White House press conference with Zinke after several weeks of Trump mulling over where the money should go . Wednesday's announcement makes clear exactly what the money will support within the National Park Service.

While visiting the battlefield, Zinke said: "The President's donation will allow generations of Americans to learn about our history and heritage on this sacred site." Zinke also announced an additional $7.2 million in grants for the American Battlefield Land Acquisition Grants program, which works to preserve battlefield lands.

Read More