back. dana bash standing by. john mccain, lindsey graham saying the president's plan for limited action as it's being called would send the wrong signal. what do we expect from this meeting today with the president and is there any doubt that his evidence is rock solid. >> reporter: that's a question that some in congress are asking. the point you heard from russia there. maybe there's a clear evidence that chemical weapons have been used but some are wondering whether it's clear and irrefutable who used it. they will continue to make the case that they have been making. as you mentioned john mccain has been pushing for the president to do more and go further on the syria than the white house is planning. they want to see a clear plan and strategy from this white house for just what the goal of any sort of military action in