In a statement, Jackson’s press secretary, Frank Watkins, would not say what he is being treated for, where he is being treated or how long the Chicago Democrat is expected to be hospitalized, according to a Reuters
Watkins said the 47-year-old congressman's condition was "more serious than we thought and initially believed" and would require "extended in-patient treatment as well as continuing medical treatment thereafter." The statement did not specify the medical problem and left his constituents and others wondering why such secrecy is warranted.
Jackson is the subject of a congressional ethics probe for his alleged involvement in the scheme by former Illinois Governor Rod Blagojevich to sell President Barack Obama's former U.S. Senate seat.
Jackson, who hasn’t worked since June 10, testified at Blagojevich's political corruption trial that he wanted to be named to the Senate seat, however denied knowing about any bribes made by his supporters to the then-governor as payment for Jackson being appointed to the Senate.
Jackson, son of activist Jesse Jackson Sr., was elected to the House of Representatives in 1995. He has been re-elected by wide margins seven times since.
This year, before falling ill, he beat out Debbie Halvorson, a former U.S. representative, in a more competitive race.
Jackson’s aides have thus far refused to answer any further questions about the congressman’s condition or whereabouts.