It looks as if the showdown will take place today on the Joe Barton (R-TX) dirty-air plan.
The House and Senate energy negotiators are expected to meet at 5 pm edt to wrap up action on energy legislation.
One issue still outstanding is Barton's plan (included in the House bill) that would lead to long delays in meeting smog standards in much of the nation. In effect, it would be the biggest weakening of the Clean Air Act in at least 15 years.
Late Friday afternoon, seven senators hinted at a possible filibuster if Barton's plan were included in the final bill. We believe Barton is still pushing for a modified version of his plan. More as we learn more.