2 U.S. Code § 196
2 U.S. Code § 196 is about Senate resolutions for investigations; limit of cost. It is under Chapter 6 (Congressional and Committee Procedure; Investigations) of Title 2 (The Congress) of the Code.
Senate resolutions providing for inquiries and investigations shall contain a limit of cost of such investigation, which limit shall not be exceeded except by vote of the Senate authorizing additional amounts.