It would tighten rules on gifts, travel and outside earnings.
The bill also fails to include party leaders in the category of politicians obliged to report their outside earnings.
Members of Congress are permitted by law to receive book royalties as outside earnings.
The trustees' new rule would require the executives to detail their outside earnings, and to indicate how much time they spent making it.
But he said he fully supported the constitutional ban on outside earnings.
With so much of their outside earnings going into debt service, Latin nations cannot make needed investments in their own economic growth.
Like other representatives in Congress, his salary last year was $77,400 and he had outside earnings totaling $26,850.
But studies show that many, or even most, welfare mothers have some outside earnings that they do not report, since their benefits would be cut.
Its members may receive as much as 30 percent above their salaries, or $26,850, in outside earnings.
It would also impose new limits on outside earnings.