A federal grand jury in Chicago indicted Hastert, 73, last week on charges of evading reporting requirements, and lying to the FBI, as he withdrew money as a payoff to cover up "prior misconduct."
News of the indictment shook Hastert's former colleagues and staff members. The no-drama Midwesterner ascended to speakership among the scandals of others and went on to become the longest-serving Republican in that post.
"Denny Hastert was the pillar of integrity. He was the guidepost, I think, for us. That's why he was selected" speaker, Davis said. "From everything I can tell, that's the way he conducted himself in office. But this isn't going to help the reputation of Congress or politicians in general, and certainly, Illinois has had its problems."
Hastert, who retired in 2007, has not appeared publicly or issued any statements since the news of his indictment.