The same day Donald Trump is expected to surrender at Fulton County Jail, House Judiciary Chairman Jim Jordan, R-Ohio, launched a probe into whether District Attorney Fani Willis coordinated with federal officials, including special counsel Jack Smith.

In a new letter, Jordan demands information and communications with the Department of Justice and federal officials on the funding Willis' office receives.

"Ms. Willis's indictment and prosecution implicate substantial federal interests, and the circumstances surrounding her actions raise serious concerns about whether such actions are politically motivated," the release states.

Willis rejected any claims of the indictments being politically motivated in a recent radio interview.

"There's really nothing sexy about this," Willis told Atlanta Up Close's Maria Boynton. "There's allegations of a crime and then to look at the law and if the facts bear out that the law has been broken, then we have a duty and a responsibility to bring charges."

-ABC News' Lauren Peller and Peter Charalambous

Former President Donald Trump is expected to shake up his legal team as soon as Thursday, just hours ahead of plans for Trump to surrender to authorities in Fulton County, Georgia, sources with direct knowledge tell ABC News.

Drew Findling is expected to depart the team and be replaced by attorney Steven Sadow, according to the sources.

Read more about the decision.

Former President Donald Trump is expected to surrender to authorities in Georgia on Thursday.

A judge had set his bond at $200,000 on Tuesday.

Trump and 18 others were charged last week by Fulton County District Attorney Fani Willis in a sweeping racketeering indictment for alleged efforts to overturn the results of the 2020 presidential election in the state of Georgia.

The former president says his actions were not illegal and that the investigation is politically motivated.

-ABC News’ Olivia Rubin, Will Steakin and Peter Charalambous

Speaking on a local Atlanta radio show, Fulton County District Attorney Fani Willis defended her decision to bring the sprawling racketeering case, arguing that the case is an even-handed application of the law.

"There's really nothing sexy about this," Willis told Atlanta Up Close's Maria Boynton. "There's allegations of a crime, and then to look at the law and if the facts bear out that the law has been broken, then we have a duty and a responsibility to bring charges."

The DA also said that recent threats made against her will not deter her from pursuing her case against the former president and his co-defendants.

"In the words of Jay-Z, brush my shoulders off and we just keep pushing," Willis said. "That is not going to deter me from doing my job."

Willis described the process of determining defendants' bond amounts as "literally just plugging things in" to a formula based on factors related to a defendant's flight risk. She also reiterated her past statement about the requirement for all defendants to surrender for processing by Friday at noon.

"Should people fail to turn themselves in, then a warrant will be filed on the system, and they'll have to be arrested," she said.

Of the 19 defendants, 15 have negotiated their bond packages and nine have subsequently been booked and released.