Louisiana Gov. Bobby Jindal, who is polling at about 2% in Iowa, made a house call to a GOP primary voter on Sunday in Sergeant Bluff, Iowa.

Sioux City Journal reporter Mike Bell noted nearly 40 people packed the home of Shirlee Mogensen to hear Jindal speak.

Ohio Gov. John Kasich says he agrees with rival Republican presidential candidate Donald Trump that a wall should be built along the U.S.-Mexico border.

But the two differ on what to do with the estimated 11 million people in the country illegally.

"Finish the wall and make it clear -- anybody that comes over that wall once we've done it, you're going back," Kasich, speaking on CBS' "Face the Nation," said Sunday. "And to the 12 million here, you know, legalize them but make sure we don't have any of the criminal element here."

Kasich has been lauded by some moderate Republicans for his stances on issues such as immigration and same-sex marriage.

The governor, who was elected in 2010, said he supports a guest-worker program and that his views on providing legal status for those in the U.S. illegally is something "the country can unite" around.

In a separate TV appearance Sunday, Trump vowed that if he were to become president, those in the country illegally would "have to go."

Read more on Trump's comments.

Donald Trump, who has angered many immigrant rights activists with inflammatory comments since he started his campaign, said Sunday that if he were to become president, those in the country illegally would “have to go.”

“We're going to keep the families together ... but they have to go,” Trump said, noting that as commander in chief he would reverse President Obama's executive orders that offer some protections to those in the country illegally. “We have to make a whole new set of standards. And when people come in, they have to come in legally,” he said.

The GOP candidate, in an interview on NBC's "Meet the Press," said he would end Obama's Deferred Action For Childhood Arrivals program, or DACA, which allows young people brought to the country illegally to work and attend college without facing deportation.

Also Sunday, Trump released an immigration plan that includes the billionaire's standard talking point on the issue: building a wall along the U.S.-Mexico border. He also called for ending birthright citizenship, tripling the number of Immigration and Customs Enforcement officers along the border and the “mandatory return of all criminal aliens.”

The Democratic National Committee called Trump's plan an obsession with "mass deportation."

"The GOP should quit treating these families as second-class citizens and join Democrats who support immigrant families and want to keep them together,” said Pablo Manriquez, DNC director of Hispanic Media.

In the NBC interview, Trump called for U.S. ground troops to be deployed to Iraq to defeat Islamic State militants by taking away their oil supplies.

“I've been saying, 'Don't go into Iraq.' They destabilized the Middle East. It was a big mistake,” he said about the Iraq war. “OK, now we're there. And you have ISIS [another designation for Islamic State]. And ISIS is taking over a lot of the oil and certain areas of Iraq. And I said you take away their wealth, that you go and knock the hell out of the oil, take back the oil. We take over the oil, which we should have done in the first place.”

Trump also said he supports affirmative action and gay rights.

“I'm fine with affirmative action. We've lived with it for a long time. And I lived with it for a long time. And I've had great relationships with lots of people,” he said.

When asked if private companies should be allowed to fire a person because he or she is gay, Trump said he doesn't“ think it should be a reason.”

In several national polls, Trump leads the crowded field of Republican presidential hopefuls in the early nominating states of Iowa and New Hampshire.

UPDATE: 11:15 a.m. - This post was updated with additional comments from the Democratic National Committee.

Two forces of nature overtook the Iowa State Fair on Saturday, adding new spectacles to the massive annual celebration of livestock, sculptures carved out of butter and cholesterol-laden treats on a stick.

Presidential candidates Hillary Rodham Clinton and Donald Trump toured the fairgrounds, a traditional rite of passage for White House hopefuls in the state that holds the first nominating contest in the nation.

Read more of this report from The Times' Seema Mehta.