Trump's son compares immigrants to animals.

Donald Trump Jr., son of Republican US presidential candidate Donald Trump, arrives for the third and final debate between Republican US presidential nominee Donald Trump and Democratic nominee Hillary Clinton at UNLV in Las Vegas, Nevada, US, October 19, 2016. REUTERS/Carlos Barria - RTX2PLQG

Donald Trump Jr, the US president's eldest son, compared illegal immigrants to animals in his latest social media rant about people who are desperately trying to enter the country.

"Do you know why you can enjoy a day at the zoo? Because walls work," Dondald Trump Jr. said on Instagram.

These comments were made after President Trump reasserted his pledge to build a wall along the Mexican border, amid a conflict with Congress that led to a federal government shutdown across the US.

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