Updated at 2:40 p.m.

A Cook County grand jury has subpoenaed Chicago’s Board of Election Commissioners for documents related to the petition challenge of a failed aldermanic candidate who ran against the alderman of powerful Illinois House Speaker Michael Madigan in this year’s city elections.

The Dec.18 subpoena, obtained by WBEZ on Friday through an open records request filed last month, asks the city’s election authority to turn over “any and all documents, records, memos, notes and correspondence pertaining to the petition challenge to Chicago 13th Ward Aldermanic candidate David Krupa.”

Krupa, a 19-year-old political newcomer garnered just 13% of the vote in the February election against incumbent Ald. Marty Quinn, 13th Ward.

But his candidacy gained the attention of Republicans who wanted to challenge the Southwest Side alderman who represents the home of Madigan, who is also chairman of the Democratic Party of Illinois.

Krupa’s candidacy was challenged by a Madigan-linked objector who noted that affidavits had been filed with the Board of Election Commissioners from those who wished to revoke their signature to have Krupa appear on the ballot. However, those affidavits numbered more than the petition signatures Krupa had turned in.

The challenge was later withdrawn.

Krupa has since filed a federal lawsuit against Quinn, Madigan and two of their campaign committees, claiming the affidavits were false. He also accuses them of threatening and intimidating him during the campaign. Quinn and Madigan are attempting to have that lawsuit thrown out.

Krupa’s candidacy also came under fire when it was revealed that an ex-girlfriend had filed an order of protection against him, accusing him of abuse.

The Chicago Tribune first reported of the subpoena’s existence.

Tony Arnold covers Illinois politics for WBEZ. Follow him @tonyjarnold.