Fifteen California lawmakers from both parties are up in arms over Gov. Gavin Newsom’s latest proposal to to use the budget process to fast-track the Delta tunnel — a deeply controversial, $20 billion plan to replumb the estuary and funnel more water south. With the clock ticking for the Legislature to pass a budget bill tackling the state’s $12 billion deficit, Newsom dropped a spending plan last week that would add sweeping changes to permitting, litigation, financing, and eminent domain and land acquisition issues aimed at speeding approval of the massive project.