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 52, Pennsylvania Insured
Municipals Income Trust, Series 297 and Virginia Investors' Quality Tax-Exempt
Trust, Series 96 (included in Van Kampen Unit Trusts, Municipal Series 545) as
of December 31, 2007, and for each of the three years in the period then ended
and the financial highlights for the period from January 25, 2005 (date of
deposit) through December 31, 2005 and for each of the two years in the period
ended December 31, 2007, contained in this Post-Effective Amendment No. 3 to
Form S-6 (File No. 333-120827) 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