Federal prosecutors have empaneled a grand jury in San Antonio and called on witnesses close to impeached Texas Attorney General Ken Paxton to give testimony, the Austin-American statesman reports, citing two people familiar with the matter. While the purpose of the testimony isn’t clear, according to the Statesman, the development follows a statement last week from Paxton’s lawyer acknowledging that his client faces an active federal inquiry. Prosecutors assemble grand juries to determine whether there’s enough evidence to issue an indictment against a potential defendant.