The former US President also speculated whether Mr Biden eased restrictions on the Mexico border out of incompetence or a pursuit of open borders by stealth.
He said: “The question is, do they do it out of incompetence? Which I happen to think. Or they do it because they really believe open borders are good for this country?.”
He then added Mr Biden’s soft approach had encouraged waves of migrants to attempt to cross the border, and said:
“We had the strongest in the history of our country.
“Very few people. Drugs were way down. Human trafficking was almost stopped.
“We did things that were amazing, and you take a look at what’s happening now. And let me tell you: They’re letting people from prisons. They’re opening their prisons. Their prisoners are coming in, their murderers, their drug addicts, and drug dealers, by the way.
“And the human traffickers are coming in. They’re letting them in. They want them in. They don’t want them in their country, so they’re saying, ‘send them to the USA.’”