Donald TrumpDonald TrumpIt's time to 'Trump' opioid addiction in the United States Trump is right: Student loan debt an 'albatross' on families, young people 6 steps for Republicans to show up at their own town halls and win 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 CruzTHE MEMO: Trump takes the fight to Congress Brietbart CEO reveals that Trump donors are part owners At CPAC, Trump lashes out at media 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.