A partial US government shutdown has taken effect after US lawmakers failed to break a budget impasse.
Mr Trump, who has to sign off any deal, is insisting at least $5bn (£4bn) in funding be included for his long-promised wall along the Mexican border.
Lawmakers adjourned last-minute talks on Friday evening.
In the absence of an agreement, funding for about a quarter of all US federal agencies lapsed at midnight (05:00 GMT Saturday).
It means the departments of Homeland Security, Transportation, Agriculture, State, and Justice will begin to shut down and federal national parks and forests will also close.
The partial closure, the third of 2018, means hundreds of thousands of federal employees will have to work unpaid or be put on temporary leave.
In a video address published on Mr Trump’s Twitter account shortly before the shutdown began, the president insisted the onus was on the Democrats to resolve the closure.
Senior Democrats have accused the president of provoking the situation with a “temper tantrum”.