Donald Trump has once again caused controversy on the subject of immigration in the US election, falsely claiming that Hillary Clinton wants to let "650 million people pour in" in one week.

While speaking to a rally at an airplane hangar in New Mexico, Trump said: "You could have 650 million people pour in and we do nothing about it.

"Think of it, that’s what could happen. You triple the size of our country in one week. Once you lose control of your borders you have no country."

If this claim on Clinton's immigration policy were correct and continued at the same rate for 12 weeks, America's population would become greater than the Earth's.