The head of a union representing U.S. Citizenship and Immigration Services (USCIS) employees on Sunday blasted President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's reported pick to head the agency.

"The resignation of Francis Lee Cissna as Director of USCIS and the possible appointment of Ken Cuccinelli as his successor spells the end of legal immigration as it currently exists," Danielle Spooner, the president of the American Federation of Government Employees union representing USCIS employees, said in a statement to CNN.

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"It has become clear that the goal of this Administration is to end immigration all together. How better to do that then by appointing as the leader of USCIS someone who knows nothing about immigration, Adjustment of Status or Naturalization, and whose sole purpose is to destroy the agency that grants these benefits."

Trump is reportedly expected to appoint Ken Cuccinelli, who served as Virginia's Attorney General between 2010 and 2014, to head USCIS.

Lee Francis Cissna resigned from his post leading USCIS at the request of Trump on Saturday.

The agency shakeup comes as Trump has pushed for his administration to take a more aggressive posture on addressing what he has called a crisis at the U.S.-Mexico border.

Cuccinelli shares similar views on immigration to Trump.