ST. PAUL — When it comes to the $846 million construction borrowing package being debated at the Capitol, many wonder if it’s too big to fail.

Or in the case of Gov. Mark Dayton, is it too big to veto?

Dayton threw a curveball Monday by saying he’d veto the bill if lawmakers use it to scuttle new rules regarding fire sprinklers in new homes. That building code clause will require homes of 4,500 square feet or more that go up after January to have built-in sprinklers.

Firefighters say it’s a feature that will save lives. Builders argue that there are other safety features that prove more effective and less costly.

Some lawmakers think Dayton is bluffing with his threat. But talks on a compromise are underway.