The constitution grants no such power to the President to COMPEL attendance to a session of Congress. Only each house of Congress has the power to arrest a member of Congress and force them to attend a session. The president could order a session of congress to reconvene for a special session but that would put Congress back in session in which case he could not force attendance because Article I of the US constitution says that congressman : shall in all Cases, except Treason, Felony and Breach of the Peace, be privileged from Arrest during their Attendance at the Session of their respective Houses, and in going to and returning from the same; and for any Speech or Debate in either House, they shall not be questioned in any other Place.
Catch 22...unfortunately.
Thanks for the clarification.
Well there you go. Another daydream of mine turns to vapor.