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DES MOINES – Republican Charles Grassley and Democrat Patty Judge sparred Friday over preserving and protecting Social Security, reworking or repealing Obamacare and raising the federal minimum wage during their second and final debate in Iowa’s U.S. Senate race.

Grassley, 83, a six-term incumbent from New Hartford, called Social Security a program that is part of the American fabric that needs to be preserved for future generations, but it will take bipartisan agreement that requires all issues to be part of the good-faith negotiations.

Judge, 73, a former Iowa lieutenant governor, agriculture secretary and state senator, said she favors taking the cap off Social Security so people making more than $118,000 a year would pay tax into the system on that additional income as a way to keep the program solvent.

Grassley said the tax issue, retirement age thresholds and benefit levels would be among the discussions in seeking to find a workable solution, but Judge said she would oppose attempts to privatize investments in the stock market.

When moderators asked the candidates how they would address rising health care costs and control prescription drug prices, Grassley said he would scrap the Affordable Care Act, known as Obamacare .