"I want to express clearly today, to the American people, that my administration will do everything in its power to defend and protect religious liberty in our land," Trump said in his first address to the annual National Prayer Breakfast.
"America must forever remain a tolerant society where all face are respected and where all of our citizens can feel safe and secure," said Trump.
Trump said that in recent days, his administration has begun to take necessary action to achieve the goal of making the US safe and secure.
"Our nation has the most generous immigration system in the world. But these are those and there are those that would exploit that generosity to undermine the values that we hold so dear. We need security," said Trump, whose move to impose a travel ban on people from seven Muslim-majority countries has invited criticism and outrage at home and from abroad.
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Trump said that in coming days, his administration will develop a system to help ensure that those admitted into the US fully embrace American values of religious and personal liberty.
Praising his Defence Secretary Gen (rtd) James Mattis,
"We have seen peace loving Muslims brutalise, victimise, murdered and oppressed by ISIS killers. We have seen threats of extermination against the Jewish people. We have seen a campaign of ISIS and genocide against Christians, where they cut off heads," he said.
"Not since the Middle Ages have we seen that. We haven't seen that, the cutting off of heads. Now they cut off the heads, they drown people in steel cages. Haven't seen this. I haven't seen this. Nobody's seen this for many, many years," said the US President.
Asserting that freedom of religion is a sacred right, Trump said it is also a right under threat all around.
"The world is under serious, serious threat in so many different ways. I've never seen it so much and so openly as since I took the position of president. The world is in trouble, but we're going to straighten it out. OK? That's what I do. I fix things. We're going to straighten it out," he said.
"Believe me. When you hear about the tough phone calls I'm having, don't worry about it. Just don't worry about it. They're tough. We have to tough. It's time we're going to be a little tough folks," he said.
"We're taking advantage of by every nation in the world virtually. It's not going to happen anymore. It's not going to happen anymore. We have seen unimaginable violence carried out in the name of religion," Trump said.
"We had tremendous success on The Apprentice. And when I ran for President, I had to leave the show. That's when I knew for sure that I was doing it. And they hired a big, big movie star, Arnold Schwarzenegger, to take my place," he said.
"We know how that turned out. The ratings went down the tubes. It's been a total disaster and Mark will never, ever bet against Trump again. And I want to just pray for Arnold if we can, for those ratings," he said.