Donald TrumpDonald John TrumpAccuser says Trump should be afraid of the truth Woman behind pro-Trump Facebook page denies being influenced by Russians Shulkin says he has White House approval to root out 'subversion' at VA MORE is stressing his support for religion as he battles his Republican presidential rivals just two weeks out from the Iowa caucuses.

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Trump reiterated during an interview published Tuesday that Christianity is "under siege," mentioning violence in Syria and calling for Christians to come together.

"We have to do something, we have to ban together, we have to become stronger as Christians because it is very bad what is happening with respect to Christianity," Trump said in "The Brody File" interview on the Christian Broadcasting Network.

"We’re not banded together properly. We have to stick together," Trump added.

Trump had a major Martin Luther King, Jr. Day speech on Monday at Liberty University, where he touted his Presbyterian faith.

The celebrity real estate tycoon is battling Sen. Ted CruzRafael (Ted) Edward CruzOvernight Health Care: Trump eases rules on insurance outside ObamaCare | HHS office on religious rights gets 300 complaints in a month | GOP chair eyes opioid bill vote by Memorial Day HHS official put on leave amid probe into social media posts Trump, Pence to address CPAC this week MORE (Texas) ahead of the first-in-the-nation caucuses Feb. 1 in Iowa, where evangelical voters are a major voting block.

Cruz last week spared with Trump over his "New York values," which Cruz argued in the latest GOP debate include supporting same-sex marriage and abortion.