Write SQL query to solve given problem: Which city in the Midwest region has the least number of clients?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.city FROM client AS T1 INNER JOIN district AS T2 ON T1.district_id = T2.district_id INNER JOIN state AS T3 ON T2.state_abbrev = T3.StateCode WHERE T3.Region = 'Midwest' GROUP BY T2.city ORDER BY COUNT(T2.city) LIMIT 1