The attorney handling a lawsuit against former Rep. Aaron Schock Aaron Jon SchockFormer GOP Rep. Aaron Schock comes out as gay Now that Aaron Schock is 'out,' he can be a powerful LGBTQ ally Feds formally drop charges against former Rep. Aaron Schock MORE (R-Ill.) by donors accusing him of misusing campaign donations has been unable to locate him.

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Daniel Kurowski, a lawyer for one of Schock’s former campaign donors, told U.S. District Court Judge Andrea Wood that he has not been able to serve the lawsuit, according to court documents.

The Chicago Sun-Times, the first outlet to report the story, added that Kurowski said the address Schock listed on his Federal Election Commission forms is vacant and none of Schock’s attorneys have responded to him.

Howard Foster, a Chicago lawyer who donated $500 to Schock’s campaign coffers, is attempting to create a class-action lawsuit that would include a large group of other former donors to Schock.

A number of the ex-congressman's former aides have been subpoenaed over the past few weeks, according to media reports and disclosures provided to the House Clerk’s Office.

Schock has not commented publicly on the case, but did cast doubt on the notion that he's unreachable in a tweet Friday morning.

"Glad to know one reporter does her homework....." he wrote, linking to a tweet from Fox News's Greta Van Susteren. Van Susteren said she called Schock and he answered his phone.

The geotag for Schock's tweet says it was sent from Illinois.

Glad to know one reporter does her homework..... https://t.co/CM1D1WNflP — Aaron Schock (@aaronschock) May 1, 2015

Schock, a former rising star in the Republican Party, and one of its top fundraisers resigned in March after a slew of allegations concerning the misuse of campaign funds and taxpayer money. Those allegations include spending on private flights, concert tickets, lavish office decorations, and that he fraudulently requested mileage reimbursements for trips he did not take.

“I leave here with sadness and humility,” Schock said during his resignation speech in March.

“For those whom I've let down, I will work tirelessly to make it up to you.”

This story was updated at 2:00 p.m.