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Texas has bused nearly 9,000 migrants to NYC and DC as an affront to Biden's immigration policies

(CNN) Texas has bused nearly 9,000 asylum seekers to New York City and Washington, DC in recent months, as part of Gov. Greg Abbott's effort to highlight his criticism of the Biden administration's immigration policies.

In a statement Friday, Abbott's office said Texas has bused more than 7,400 migrants to DC since April and more than 1,500 migrants to New York City since August 5.

"The busing mission is providing much-needed relief to our overwhelmed border communities," the statement said. "Operation Lone Star continues to fill the dangerous gaps left by the Biden Administration's refusal to secure the border."

A fierce critic of the Biden administration's immigration policies, Abbott began sending hundreds of willing migrants on buses to DC earlier this year as an affront to the administration. Abbott's office has said that "to board a bus or flight, a migrant must volunteer to be transported and show documentation from DHS."

New York City has received record numbers of migrants this week and more buses are expected, a spokesperson for the mayor's Office of Immigration told CNN on Saturday.

Mayor Eric Adams and other city officials have previously accused Abbott's administration of forcing asylum seekers onto buses bound for New York City and not coordinating with city officials on the transfer of people. Earlier this month, city officials said intake centers were already overwhelmed with more than 4,000 people since a surge that began in May.

A bus carrying migrants who crossed the border from Mexico into Texas arrives into the Port Authority station Thursday.

"It's unimaginable. Come to a country and your first visit here, someone is throwing you out, as the Governor of Texas is doing, then trying to navigate this complex country to deliver your services," Adams said at an unrelated press event earlier this month.

Department of Homeland Security Secretary Alejandro Mayorkas told CNN on Thursday that Abbott's efforts to bus migrants to DC and New York is throwing the federal system for processing migrants "out of whack" and criticized the governor for not coordinating with federal authorities.

Mayorkas said it's "problematic" when an official like Abbott works "unilaterally."

"That lack of coordination wreaks problems in our very efficient processing," Mayorkas told CNN in Eagle Pass while he was at the U.S.-Mexico border on Thursday, adding that it's making the work of DHS "more difficult."

Mayorkas criticized Abbott for not working with destination cities.

"These cities have certain capacities," he said. "They have infrastructure to address the needs of migrants, and we need to calibrate the movement of people, according to their capacity and their efficiencies. And that is not being done."

Mayorkas said his department has reached out to Abbott to seek better coordination, but Abbott has not responded.

CNN's Rosa Flores, Rosalina Nieves and Ashley Killough contributed to this report.