Bills

Bill sponsors

GET/v1/bills/{billId}/sponsorsAll plans

The sponsor and every cosponsor, with party, state and the date each joined. Use it to track coalitions and bipartisan support.

curl "https://api.thelobbynews.com/v1/bills/119-hr-6644/sponsors" \
  -H "Authorization: Bearer lobby_live_..."

Response 200

{
  "billId": "119-hr-6644",
  "sponsor": {
    "bioguideId": "H001072",
    "name": "J. French Hill",
    "party": "Republican",
    "state": "AR",
    "district": 2
  },
  "cosponsors": [
    {
      "member": {
        "bioguideId": "C001061",
        "name": "Emanuel Cleaver",
        "party": "Democratic",
        "state": "MO",
        "district": 5
      },
      "joinedDate": "2025-12-11",
      "withdrawnDate": null,
      "isOriginal": true
    },
    {
      "member": {
        "bioguideId": "F000474",
        "name": "Mike Flood",
        "party": "Republican",
        "state": "NE",
        "district": 1
      },
      "joinedDate": "2025-12-11",
      "withdrawnDate": null,
      "isOriginal": true
    },
    {
      "member": {
        "bioguideId": "W000187",
        "name": "Maxine Waters",
        "party": "Democratic",
        "state": "CA",
        "district": 43
      },
      "joinedDate": "2025-12-11",
      "withdrawnDate": null,
      "isOriginal": true
    }
  ]
}

A real response, trimmed for length: lists cut to three items, long text shortened.

Path parameters

Name	Description
billIdrequiredstring	Congress, type and number, e.g. 119-hr-1234.

Response

Field	Description
billIdstring
sponsorMemberRef \| null
sponsor.bioguideIdstring
sponsor.namestring
sponsor.partystring \| null
sponsor.statestring \| null
sponsor.districtinteger \| null
cosponsorsBillCosponsor[]
cosponsors[].memberMemberRef
cosponsors[].joinedDatestring
cosponsors[].withdrawnDatestring \| null
cosponsors[].isOriginalboolean