LANCASTER, Pa. -

Two of the Republican candidates for president are in Pennsylvania a week ahead of the state's primary election.

Mitt Romney, the GOP's all-but-certain presidential nominee, and Newt Gingrich, are scheduled to speak at the Republican Committee of Lancaster County’s spring event in Lancaster on Tuesday evening.

Rick Santorum, who suspended his campaign last week, has canceled his appearance. Santorum, a former Pennsylvania U.S. senator, hasn't hinted whether he'll eventually endorse Romney, but said he'll say soon how he'll continue to press for conservatism in politics.

Romney made an earlier appearance in Bethel Park, Pa. He took advantage of it being Tax Day to talk about his tax plans.

Sitting around a picnic table with eight Pittsburgh-area residents, Romney touted his plan leave all the Bush-era tax cuts in effect and also cut income tax rates across-the-board by an additional 20%.

Romney also wants to reduce or eliminate various deductions as part of tax reform, although he has yet to provide details.