WATCH: White House questioned on flights of migrant children across the country flown under cover of night

"Why is the administration flying thousands of migrants from the border to Florida and New York in the middle of the night?" Fox News’ Peter Doocy asked.

"Well, I'm not sure that's in the middle of the night. But let me tell you what's happening here," replied Psaki.

Doocy interjected by pointing out two flights that were observed to have arrived at the Westchester County Airport not long after 2am.

"Here we are talking about early flights, earlier than you might like to take a flight. It is our legal responsibility to safely care for unaccompanied children until they can be swiftly unified with a parent or a vetted sponsor. And that's something we take seriously," said Psaki.

"As a part of the unification process, our Office of Refugee Resettlement facilitates travel for children in its custody to their families or sponsors across the country," she continued.

"So in recent weeks, unaccompanied children pass through the Westchester airport, which I think is what you're referring to, in route to their final destination to be unified with their parents or vetted sponsor. It's no surprise that kids can be seen traveling through states, not just New York. It's something that we're also working to unite children with their family members or vetted sponsors in other parts of the country as well," Psaki said.

A report from the New York Post on Monday revealed that at least 2,000 unaccompanied migrant children have been flown from the border to Westchester County Airport since August on 21 flights. Many of these flights have landed in New York very late at night, or in the early hours of the morning.

Recent flights reportedly landed at 10:49 pm on Wednesday and 9:52 pm on Friday, where county cops stood by as passengers were loaded onto buses. Two flights on August 20 arrived just after 2 am, the latest flights to land.

Passengers, who were loaded onto buses, later met up with relatives or sponsors in New Jersey, or were dropped off at a residential facility on Long Island.