Former House Speaker Dennis Hastert leaves the Dirksen Federal Court House in a wheelchair after his sentencing on April 27, 2016 in Chicago, Ill. Hastert was sentenced to 15 months in prison and ordered to pay $250,000 to a victim's fund for breaking banking laws; he had paid hush money to conceal his decades-old sexual abuse of a 14-year-old. Joshua Lott/Getty Images hide caption

Former House Speaker Dennis Hastert arrives at the federal courthouse in Chicago last year for his arraignment. Charles Rex Arbogast/AP hide caption

Former House Speaker Dennis Hastert arrives at the federal courthouse on Wednesday in Chicago for his sentencing. Charles Rex Arbogast/AP hide caption

Former Republican Speaker of the House Dennis Hastert leaves the courthouse following his arraignment on June 9 in Chicago. In a related case, a man who says he was abused by Hastert as a teen is suing over hush money. Scott Olson/Getty Images hide caption

Former U.S. House Speaker Dennis Hastert leaves a federal courthouse in Chicago this fall after pleading guilty to charges related to a hush money scandal. Zbigniew Bzdak/Chicago Tribune/TNS via Getty Images hide caption

Former House Speaker Dennis Hastert (center) arrives at the federal courthouse Wednesday in Chicago. Matt Marton /AP hide caption

Former House Speaker Dennis Hastert departs the federal courthouse in Chicago on June 9 after his arraignment. Christian K. Lee/AP hide caption

Former House Speaker Dennis Hastert arrives at the federal courthouse for his arraignment. He is accused of crimes allegedly arising from an attempt to pay $3.5 million to someone from his days as a high school teacher not to reveal a secret about past misconduct. Charles Rex Arbogast/AP hide caption

Former House Speaker Dennis Hastert speaks in Washington on July 28, 2009, following the unveiling of his portrait. Pablo Martinez Monsivais/AP hide caption

Then-U.S. Rep. Dennis Hastert greets a supporter in Yorkville, Ill., in August 2007, after he announced that he would not seek another term in Congress. Hastert was indicted May 28 on charges of evading cash-withdrawal reporting requirements and lying to the FBI, in connection with what the indictment described as $3.5 million in hush money slowly taken out and paid to an unnamed individual. John Gress/Reuters/Landov hide caption

President Obama and House Speaker John Boehner at the White House in November. Carolyn Kaster/AP hide caption