HARRISBURG, Pa. (AP) — Weak tax collections are putting Republican Pennsylvania Gov. Tom Corbett under pressure to sign off on another tax increase, which he pledged not to do when he ran for office.

The problem is this: Tax collections are about $600 million behind expectations, the worst collapse since 2010. That’s a shortfall tantamount to $1.2 billion in Corbett’s original $29.4 billion budget proposal.