U.S. Sen. John Kerry agreed Friday to debate primary challenger Ed O'Reilly, according the Kerry campaign.

There will be one debate, set to take place on WBZ-TV and it will be hosted by the station's political analyst, Jon Keller. Further details are still being finalized.

O'Reilly (Gloucester) has made his debate proposal a major part of his campaign, repeatedly charging that Kerry (Boston) was ducking his debate challenge. The final agreement falls well short of O'Reilly's original proposal, which called on the candidates to meet in each of the state's 14 counties, each University of Massachusetts campus and on four television networks.

The agreement comes after representatives of each campaign met Friday to work out the details.