A top U.S. Immigration and Customs Enforcement official admitted before the Senate Immigration Subcommittee on Thursday the Obama administration's reforms to deportation policies have caused the decrease in removals of people in the U.S. illegally.

In the hearing, Chairman Jeff Sessions, R-Ala., questioned officials about the reason for declining deportation figures and increasing criminal alien release numbers.

Sessions purported that immigration officers receive calls from police officers in non-sanctuary cities asking for agents to take an arrested illegal alien into federal custody, but the agents do not respond because the criminal alien offenders don't meet removal guidelines, which were modified in President Obama's November 2014 executive actions on immigration.

"That is true," testifying witness Thomas Homan, executive associate director of enforcement and removal operations within ICE, told the subcommittee.

"So it's not true then that your numbers are down because you don't have people to deport," Sessions stated. "You have 'em to deport, but you have policies that tell you not to deport whole categories of people who are here unlawfully."

"That's a factor. Yes, sir," Homan responded.

Sessions has endorsed Donald Trump for president, much ado to his immigration views, which were shaped by Sessions' advisors. The senator's former communications director left Capitol Hill in January to join Trump's campaign as a senior advisor.