<PAGE>
Exhibit 23
Letterhead of Kenny S&P Evaluation Services
(a division of J.J. Kenny Co., Inc.)
June 30, 2000
Prudential Securities Incorporated
1 New York Plaza
New York, NY 10292
Re: National Municipal Trust
Post-Effective Amendment No. 7
Series 158
Gentlemen:
We have examined the post-effective Amendment to the Registration Statement
File No. 33-58266 for the above-captioned trust. We hereby acknowledge that
Kenny S&P Evaluation Services, a division of J.J. Kenny Co., Inc., is currently
acting as the evaluator for the trust. We hereby consent to the use in the
Registration Statement of the references to Kenny S&P Evaluation Services, a
division of J.J. Kenny Co., Inc., as evaluator.
In addition, we hereby confirm that the ratings indicated in the
Registration Statement for the respective bonds comprising the trust portfolio
are the ratings currently indicated in our KENNYBASE database as of the date of
the evaluation report.
You are hereby authorized to file a copy of this letter with the Securities
and Exchange Commission.
Sincerely,
Frank A. Ciccotto
Frank A. Ciccotto
Vice President
<PAGE>
Exhibit 23
Letterhead of Kenny S&P Evaluation Services
(a division of J.J. Kenny Co., Inc.)
June 30, 2000
Prudential Securities Incorporated
1 New York Plaza
New York, NY 10292
Re: National Municipal Trust
Post-Effective Amendment No. 7
Multistate Series 57
Gentlemen:
We have examined the post-effective Amendment to the Registration Statement
File No. 33-55666 for the above-captioned trust. We hereby acknowledge that
Kenny S&P Evaluation Services, a division of J.J. Kenny Co., Inc., is currently
acting as the evaluator for the trust. We hereby consent to the use in the
Registration Statement of the references to Kenny S&P Evaluation Services, a
division of J.J. Kenny Co., Inc., as evaluator.
In addition, we hereby confirm that the ratings indicated in the
Registration Statement for the respective bonds comprising the trust portfolio
are the ratings currently indicated in our KENNYBASE database as of the date of
the evaluation report.
You are hereby authorized to file a copy of this letter with the Securities
and Exchange Commission.
Sincerely,
Frank A. Ciccotto
Frank A. Ciccotto
Vice President
