Donald Trump Sunday said he would be a different person if he is elected President and also predicated he will win Iowa's pivotal Republican caucuses next month.

Appearing on CBS' "Face the Nation" Sunday, Trump said that as president, he would be less combative but remain what he called a cheerleader for the United States and a foe of political correctness.

"I would probably not talk as much," Trump said. He said he is busy defending himself from attacks on the campaign trail.

But the real estate developer said he would continue to hold rallies to buck up Americans.

"I would be very enthusiastic, like I am right now, toward the country," Trump said. "We need spirit. We need a cheerleader."

"President Obama's a bad cheerleader," Trump added, calling Obama divisive. "I thought he would be a good cheerleader."

Trump said he is confident of victory in Iowa, ignoring polls that generally show him trailing Sen. Ted Cruz, R-Texas. That's a departure from presidential candidates usually coached to downplay their chances in key states in the hope they can exceed expectations.

Trump ripped rival presidential candidates Hillary Clinton, Cruz and Sen. Marco Rubio, R-Fla.

Trump said Cruz and Rubio are working to correct politically problematic stances on illegal immigration because "they were both weak on it, and I have been very strong on it." Trump said Cruz copied him by talking about building a wall along the U.S.-Mexico border.

Trump accused Clinton of pandering to women by playing up her gender.

"I have more respect for women, by far than Hillary Clinton does, and I will do more for women," Trump said, citing his record of employing female executives.

Trump failed to join other GOP candidates in faulting President Obama for reports the U.S. spied on top Israeli officials. The former reality show star wouldn't rule out spying on Israel.

"I would certainly not want to do it, but I have to say this: We're being spied on by everybody," Trump said. "I would say that I would leave open possibilities of doing whatever it takes to make our country very, very strong and to make our country great again."

Trump did fault Obama over reports the president will tighten rules on background checks for gun purchases, but seemed unsure of the details and backed off when pressed.

"I'm gonna have to take a look at it, but I don't like changing it anyway," he said, arguing Obama's actions would affect Americans' constitutional right to bear arms.

Trump said he'd tackle gun violence by spending more on mental healthcare.

"We have sickos all over the place, and that's the problem," he said.