Veto it and it goes back to congress. Either they override his veto or he gets a new budget. But a lot of people forget. The WH was actively involved in this budget. Trump was only playing the part of surprise and disappointment. Unless his minions don't tell him what's in a bill. Heck, VP Pence was out YESTERDAY touting the great bill headed to the White House for signature.
This isn't some deep state move. This was a cooperative effort between the deep state and Trump and his team.
Nope.
This was a cooperative effort between *every* elected,and appointed,Rat and a few "Never Trumpers" who call themselves Republicans.