How do you UNION with multiple CTEs?

How do you use UNION with multiple Common Table Expressions?

I'm trying to put together some summary numbers but no matter where I put the ;, I always get an error

SELECT  COUNT(*)
FROM    dbo.Decision_Data
UNION
SELECT  COUNT(DISTINCT Client_No)
FROM    dbo.Decision_Data
UNION
WITH    [Clients]
          AS ( SELECT   Client_No
               FROM     dbo.Decision_Data
               GROUP BY Client_No
               HAVING   COUNT(*) = 1
             )
    SELECT  COUNT(*) AS [Clients Single Record CTE]
    FROM    Clients;

I appreciate in the example above I can move the single CTE to the beginning, but I have a number of CTEs I'd like to UNION