Donald Trump’s plan to deport 11 million undocumented immigrants from the US has been attacked by his party rivals in the fourth Republican debate on Fox Business.
The Republican frontrunner’s hard-line proposal was attacked as impractical and divisive by John Kasich and Jeb Bush, who are also running for the Republican presidential nomination.
Donald Trump, a billionaire New Yorker who has been leading in the polls, was booed as he tried to counter-attack.
Another source of friction at the debate in Milwaukee was foreign policy.
The eight candidates were divided on whether the US should do more to intervene in the Middle East, especially in the fight against ISIS.
However, immigration sparked the biggest confrontation, when Donald Trump said a wall should be built at the US-Mexico border and all migrants living illegally in the US must be deported.
This was met with disdain by John Kasich, the governor of Ohio.
“Come on, folks, we all know you can’t pick them up and ship them back across the border. It’s a silly argument. It’s not an adult argument.”
Former Florida Governor Jeb Bush said it would tear families apart and played into the hands of Democratic frontrunner Hillary Clinton.
The fourth Republican debate, hosted by Fox Business, began by talking about raising the minimum wage, which several candidates opposed.
Florida Senator Marco Rubio said vocational education was instead a better way to unlock American potential.
“Welders make more money than philosophers. We need more welders and less philosophers.”
At one point, Marco Rubio and Kentucky Senator Rand Paul tangled over the issue of military spending, with Rand Paul saying his rival’s plan to increase military spending went against conservative principles.
“We can’t even have an economy if we’re not safe,” responded Marco Rubio.
The primary elections begin in February in Iowa.