Former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE said Sunday that because of the partial government shutdown, "innocent people are now paying the price for another lie" from 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.

"FBI families will spend Christmas without a paycheck. This president promised Mexico would pay for the wall but innocent people are now paying the price for another lie. Our thoughts are with hardworking public servants and their families," Comey wrote in a tweet.

FBI families will spend Christmas without a paycheck. This president promised Mexico would pay for the wall but innocent people are now paying the price for another lie. Our thoughts are with hardworking public servants and their families. — James Comey (@Comey) December 23, 2018

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Trump pledged while campaigning for president that Mexico would fund the wall.

Incoming White House acting chief of staff Mick Mulvaney on Sunday acknowledged that the Department of Homeland Security can't force Mexico to pay for the wall.

"Technically, you and I both know that it cannot work exactly like that. ... Department of Homeland Security can’t actually spend money from Mexico. We have to get it from Treasury," Mulvaney said on ABC's "This Week."

The federal government entered a partial shutdown on Saturday after lawmakers were unable to reach an agreement over Trump's demand for $5 billion in funding for a wall along the southern border.