The US president said: “A month ago we had thousands of young kids in custody.
“It is way down now.”
He also looked to shift blame for the migrant crisis along the Mexican border onto the previous president Donald Trump.
The United States’ southern border faces a growing crisis as caravans of migrants make their way from south and central America, fleeing poverty and economic hardship.
Last month President Biden was forced to deploy an additional 10,000 troops to the countries frontier with Mexico.
The US-Mexico border is key transit for migrant crossing over the border illegally.
Border agencies in the US have struggled to cope with the thousands of migrants arriving, with insufficient shelter and a rise in accompanied minors fueling concern from aid agencies.