HARRISBURG — Gov. Tom Corbett may not announce whether he will support the expansion of Medicaid under the federal health care law when he delivers his budget address to the Legislature today.

What to do about Medicaid is a major dilemma for the Republican governor, who as attorney general earlier joined an ultimately unsuccessful multi-state lawsuit to try to throw out President Barack Obama’s sweeping 2010 health care law.

Senate Majority Leader Dominic Pileggi said that during a meeting with Corbett administration officials Monday he was told they were not able to get all their questions answered by the Obama administration.

Many had hoped the Medicaid decision would be unveiled alongside Corbett’s 2013-14 spending plan.

“He has yet to come to a conclusion,” Pileggi said in an interview after he attended a Senate Appropriations Committee meeting. “We’re not really getting the information we need to make a decision.”

A spokeswoman for Corbett’s Department of Public Welfare, which manages Pennsylvania’s Medicaid program, would not say Monday whether the governor had reached a decision on a Medicaid expansion. The spokeswoman, Anne Bale, also said there is no deadline for the governor to decide.

Sen. Vincent Hughes, D-Philadelphia, noted that several other Republican governors are committed to a Medicaid expansion — including, on Monday, Ohio’s John Kasich — and said Corbett’s reticence suggests that he is beholden to tea party conservatives who oppose something that could lower the cost of health care and boost the state’s economy.

“The tea party has him in their grips,” said Hughes, the ranking Democrat on the Senate Appropriations Committee.

Today, Corbett is expected to announce a budget for the fiscal year beginning July 1 that increases spending slightly over this year’s $27.7 billion to account for the rising costs for public employee pensions, health care for the poor, debt and prisons.

He has said he will call for changes to pensions in an effort to lower the government’s cost and is expected to roll out a long-term plan to improve the state’s roads, bridges and mass transit that revolves around raising wholesale fuel taxes.