Donald TrumpDonald TrumpSeven key players for Trump on immigration Spicer: Media coverage of Trump has not been fair Kasich finds it hard to rule out 2020 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 CruzTed CruzKasich finds it hard to rule out 2020 Trump in campaign mode at NRA convention Trump’s hands are tied on 9th Circuit 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.