Write SQL query to solve given problem: What form of governance does the least prosperous nation in the world have?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T3.Government FROM country AS T1 INNER JOIN economy AS T2 ON T1.Code = T2.Country INNER JOIN politics AS T3 ON T3.Country = T2.Country WHERE T2.GDP IS NOT NULL ORDER BY T2.GDP ASC LIMIT 1