When receiving a bill passed by Congress, POTUS should have the ability to veto only part of a lump sum within a bill via a Line Item Veto !
This can weed out the “pork”, pet causes sought by just one Congressman which benefits only his State or District, hidden within the lump sum of a bill that might otherwise be agreeable to POTUS to sign.
Discretionary Spending sums within bills should all be eliminated. They are kind of like “petty cash” where random amounts of the taxpayers’ money may be spent at will, with no accountability and without any further approval by Congress, at the discretion of the Department Head or whomever it is assigned to.