WASHINGTON (AP) — Senate Republican leaders considered keeping one of former President Barack Obama's big tax increases on wealthier Americans and using the money to fatten proposed subsidies for the poor in a bid Thursday to placate moderate GOP lawmakers and salvage their struggling health care bill.

With a core priority tottering, top Republicans also assessed an amendment pushed by conservatives to let insurers offer plans with low premiums and scant benefits. To do so, a company would also have to sell a policy that abides by the consumer-friendly coverage requirements in Obama's 2010 sta...