A bill becomes law if signed by the President or if not signed within 10 days and Congress is in session. If Congress adjourns before the 10 days and the President has not signed the bill then it does not become law (Pocket Veto.)
Amounts paid. or reasonably expected to be paid during estate administration are deductible on Form 706; or, executor can elect to. claim some administration expenses on Form 1041 when paid. On Form 1041, expense is subject to 2% adjusted gross.
The cost of your mission trip, which consists of unreimbursed volunteer expenses and mileage you have incurred, should be tax deductible as long as they are substantiated However, the value of your time and services is never deductible as a charitable deduction.