Santorum will address the Family Leadership Summit, an event co-hosted by The Family Leader, a powerful organization of Iowa social conservatives, as well as Citizens United, Heritage Action, and the National Organization for Marriage. The summit's focus is on putting principle ahead of politics on gay marriage and other social issues.

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"I am greatly looking forward to speaking at this year's Family Leadership Summit. This gathering of conservatives provides each of us with an opportunity to exchange ideas and discuss the path forward as we tackle the moral and cultural challenges facing our country," Santorum said. "The Family Leader has provided exceptional leadership on these issues, and I appreciate the opportunity to join them for this year's summit."

The group's co-founder, anti-gay marriage activist and former Iowa gubernatorial candidate Bob Vander Plaats, endorsed Santorum before the 2012 Iowa caucuses and gave the former senator a big boost on his way to winning the state.

Santorum has made a number of trips back to Iowa in the past year.

The group has also invited a number of other potential presidential candidates: GOP Sens. Rand PaulRand PaulThis week: GOP picks up the pieces after healthcare defeat Trump, GOP fumble chance to govern GOP senators pitch alternatives after House pulls ObamaCare repeal bill MORE (Ky.), Marco RubioMarco RubioWeek ahead: Senate panel to vote on Trump's Labor pick Senators introduce new Iran sanctions Senate intel panel has not seen Nunes surveillance documents: lawmakers MORE (Fla.) and Ted CruzTed CruzHow 'Big Pharma' stifles pharmaceutical innovation AIPAC must reach out to President Trump Under pressure, Dems hold back Gorsuch support MORE (Texas), as well as Louisiana Gov. Bobby Jindal (R), and Texas Gov. Rick Perry (R).