house issues a veto threat. also bill clinton making the case for president obama by invoking the ghost of osama bin laden. plus, space shuttle enterprise arrives with a bang in its new hometown, new york city. i m wolf blitzer. you re in the situation room. captions by vitac www.vitac.com a sharp battle is unfolding here in washington over a bill to extend lower interest rates on student loans. millions of students are involved in this. it s a bipartisan goal, but there s partisan bickering over how to pay for it and now the white house is upping the ante with a veto threat. our congressional correspondent kate bolduan is watching this unfold. what are you seeing on capitol hill, kate? this fight against student loans is about much more than student loans but it s drawn familiar battle lines. house republicans versus president obama and congressional democrats. reporter: defying a veto threat from president obama house republicans push ahead friday to pass a bill