CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

     We have issued our report dated April 22, 2008, accompanying the financial
statements of Investment Grade Municipal Trust, Series 9, California Insured
Municipals Income Trust, Series 189, Michigan Insured Municipals Income Trust,
Series 167 and Strategic Municipal Trust, Intermediate Series 4 (included in Van
Kampen Focus Portfolios, Municipal Series 366) as of December 31, 2007, and for
each of the three years in the period then ended and the financial highlights
for each of the five years in the period ended December 31, 2007, contained in
this Post-Effective Amendment No. 6 to Form S-6 (File No. 333-76958) and
Prospectus.

     We hereby consent to the use of the aforementioned report in this
Post-Effective Amendment and Prospectus and to the use of our name as it appears
under the caption "Other Matters-Independent Registered Public Accounting Firm".

                                                  GRANT THORNTON LLP

New York, New York
April 22, 2008