The White House is seeking to cut more than $2.5 billion from the annual budget of the Environmental Protection Agency — an overall reduction of more than 23 percent. The fiscal 2019 proposal released Monday marks the Trump administration’s latest attempt to shrink the reach of an agency the president once promised to reduce to “little tidbits.” The EPA already has lost hundreds of employees to  buyouts and retirements over the past year, and its staffing is now at  Reagan-era levels.