It's money in addition to what was already budgeted, stolen from NPS.

From CNN Politics

Washington (CNN)The National Park Service will redirect nearly $2.5 million to help cover costs related to President Donald Trump's July 4 extravaganza in Washington, DC, money that is usually "primarily intended to improve parks across the country," The Washington Post reported Tuesday.
The Post said the use of the funds was confirmed by two unnamed individuals familiar with the agreement. According to the paper, the redirected funds are "typically used to enhance the visitor experience either on the (National) Mall or at smaller parks across the country with projects ranging from road and bridge repair to habitat restoration."