While a proposal has yet to be formalized, the Redskins will make a trade offer to the Bears aimed at acquiring two-time Pro Bowl weakside linebacker Lance Briggs, agent Drew Rosenhaus and two league sources told ESPN.com late Monday night. Washington will propose a swap of first-round draft picks in this year's draft -- the Redskins own the sixth overall selection and Chicago has the 31st choice in the lottery -- in exchange for Briggs. The potential deal, which is expected to pick up steam on Tuesday morning as the annual NFL meetings continue here, would be contingent on the Redskins signing Briggs to a long-term contract.