WASHINGTON -- Differences over whether immigrants should be deported for failing to have health insurance or pay their healthcare bills have stalled a bipartisan group of House lawmakers, who blew past a self-imposed Thursday deadline as they pressed forward on a sweeping immigration overhaul. Negotiators emerged upbeat from a closed-door meeting in the Capitol and said they remained on track to produce a bill by June. That, in itself, was significant, after the group of eight was on the verge of breakup. "We were all positive that we can move forward," said Rep. Raul Labrador of Idaho, a top Republican leading the bipartisan effort.