Sponsorship and Cosponsorship of House Bills

January 12, 2017 (RS22477)

A Representative who introduces a bill or resolution in the House is called its sponsor. Under House Rule XII, clause 7, several Members together may submit a bill, but only the Member whose name appears first on the bill is considered its sponsor; the others are cosponsors. A bill can have only one sponsor, but there is no limit on the number of cosponsors it may have.1

Sponsorship of a Bill

Representatives introduce bills in the House by placing them in the wooden box, or "hopper," located at the bill clerk's desk on the chamber floor when the House is in session (including a "pro forma" session).2 An original signature of the sponsor must appear on the measure when it is introduced. Cosponsors do not sign the bill, but sponsors are "strongly advised" in a Dear Colleague letter from the Speaker's office to include a cosponsor's original signature on the cosponsorship form during the 115th Congress (2017-2018).3 To add cosponsors, the sponsor may drop in the hopper a cosponsorship form prepared by the clerk's office that identifies the names and states of Members who want to be cosponsors.4 Cosponsorship is generally viewed as a sign that the Member supports the measure.

Rule XII, clause 7(c) requires that sponsors provide a statement of constitutional authority at the time of introduction.5 The constitutional authority of Congress is set forth beginning in Article I, Section of 1 of the U.S. Constitution, which states that "all legislative powers herein granted shall be vested in a Congress of the United States." Article 1, Section 8 of the founding document contains additional clarity regarding Congress's enumerated powers.6 The statement is not required to accompany the introduction of simple or concurrent resolutions.

Members typically sponsor bills they support. On occasion, a Representative may introduce a bill as a courtesy, such as legislation proposed by the President or a senior Administration official. Citizens and interest group representatives may also ask a Member to introduce legislation on their behalf. In these cases, the sponsor may designate the bill as introduced "by request." As House Rule XII, clause 7(a)(5) states, "When a bill or resolution is introduced 'by request,' those words shall be entered on the Journal and printed in the Congressional Record." Introducing a bill "by request" allows for a degree of separation between the sponsor of the measure and the legislative text it contains.

A sponsor may not reclaim a measure he or she has placed in the hopper after it has been assigned a number and referred to committee, a process that normally occurs the same day. Once a measure has been numbered and referred, it becomes the property of the House and cannot be modified by the sponsor, even by unanimous consent. It is too late at this point to make any changes to the bill—however cosmetic they might be—except by amending the bill on the House floor during its consideration.7 Introduced bills and resolutions can be taken up by the House even if the sponsor resigns from the House or dies.

Cosponsorship of a Bill

Representatives may cosponsor a bill either at the time of its introduction or subsequently. Members whose names are submitted with a bill at the time of introduction are commonly referred to as "original" cosponsors, and those Members will be identified as such when the bill is first printed. Once a bill has been introduced, Members may add their names as cosponsors until the bill has been reported from all the committees to which it is referred, or until the committees have been discharged from further consideration of the bill. If an unreported bill is scheduled for consideration on the House floor—which may occur by way of the suspensions procedure (House Rule XV) or under the terms of a special rule reported by the House Rules Committee—then cosponsors may be added up to the point that a vote occurs on the motion to suspend the rules or to adopt the special rule.

Adding cosponsors can be accomplished with the same form used to identify original cosponsors. Completed forms should be signed by the sponsor and placed in the hopper when the House is in session. The names of added cosponsors appear in the Congressional Record and in any subsequent printings of the bill. Sponsors and cosponsors of bills and amendments may also be found by searching Congress.gov, an online database of legislative activity.8 House Rule XII, clause 7(b) allows a bill to be reprinted if 20 or more cosponsors have been added since the previous printing, provided the sponsor submits a written request to the Speaker that the bill be reprinted.

A cosponsor may also have his or her name removed from a bill until the last committee of referral has reported it or has been discharged from its consideration. While adding cosponsors can be transacted through the hopper, removing a cosponsorship requires either the cosponsor or the sponsor of the bill to make a unanimous consent request on the House floor.9

Rules governing the number of cosponsors permitted on a bill have changed over the years. From 1967 to 1979, House rules limited the number of cosponsors to 25 per bill, requiring the introduction of identical bills when the number of cosponsors exceeded 25. Since 1979, an unlimited number of cosponsors have been allowed. Private bills are prohibited from having cosponsors but may be introduced in the same way as public bills.10

Gaining Cosponsors

Supporters of a bill often seek cosponsors to demonstrate its popularity and improve its chances for passage. One of the most common techniques to attract cosponsors is the "Dear Colleague" letter, a notice delivered to some or all Member offices either in print or via email. These letters are so called after the salutation with which they begin.

No House rules govern "Dear Colleague" letters. They are, in effect, a sponsor's advertisement for a bill (or, sometimes, an amendment). A typical letter will briefly state the issue the bill addresses, its major components, and its policy importance, and include an invitation to sign on as a cosponsor. Almost always, they carry the name and phone number of a staff aide to contact. A system for distributing "Dear Colleagues" through the Internet was implemented in the 110th Congress.11

Before a bill is formally introduced, a Member who wishes to become a cosponsor, or an aide acting at his or her direction, may contact the sponsoring Member's office and request that his or her name be added to the bill. A form listing cosponsors is usually kept by a staff aide and submitted along with the bill at introduction. After the bill is introduced, a Member may also contact the sponsor's office and ask to be listed as a cosponsor. The sponsor decides when to submit these additional cosponsors to the House Clerk for publication in the Congressional Record.

Author Contact Information

[author name scrubbed], Analyst on Congress and the Legislative Process ([email address scrubbed], [phone number scrubbed])


This report was originally prepared by former CRS Specialist Richard C. Sachs. Please direct any inquiries to the current author.



Twelve bills with multiple sponsors were introduced on January 4, 1995, in accordance with H.Res. 6 (104th Congress), the House rules package adopted for the 104th Congress (1995-1996). Pursuant to Section 223(g) of H.Res. 6, the first 20 bills and the first two joint resolutions introduced in the 104th Congress were allowed to have two or more Members reflected as the sponsor.


For more information on bill introduction in the House, see CRS Report R44001, Introducing a House Bill or Resolution, by [author name scrubbed].


The Speaker's Dear Colleague letter on the subject of cosponsorship was sent on December 30, 2016, and is available online at http://e-dearcolleague.house.gov/details.aspx?199130. The purpose of the Speaker's advisement is to prevent errors in the identification of cosponsors. Some Members are likely to share similar or similar-sounding names given the membership of the House, which in rare cases has caused a Member to have been misidentified as a cosponsor.


Cosponsorship forms are available for download on HouseNet, the House's internal website, at https://housenet.house.gov/sites/housenet.house.gov/files/forms/Add-Cosponsor-Form.pdf.


Constitutional authority forms are available for download on the website of the Office of Legislative Counsel, at http://legcoun.house.gov/members/HOLC/Resources/casform.pdf.


For more information on the kinds of authority that could be cited to meet this requirement, see CRS Report R41548, Sources of Constitutional Authority and House Rule XII, Clause 7(c), by [author name scrubbed], as well as guidance issued by the House Legislative Counsel, at http://legcoun.house.gov/members/HOLC/Resources/const_auth_statement.html.


On House amending practices, see CRS Report 98-995, The Amending Process in the House of Representatives, by [author name scrubbed].


See http://www.congress.gov/.


An example statement to this effect can be found in the Congressional Record, vol. 162, July 14, 2016, p. H4974.


For a study of the consideration of private bills in the House, see CRS Report RS22450, Procedural Analysis of Private Laws Enacted: 1986-2015, by [author name scrubbed].


See CRS Report RL34636, "Dear Colleague" Letters: Current Practices, by [author name scrubbed].