Hastert's tenure has so far spanned 20 years, including more than seven as the longest serving Republican speaker in the history of Congress.
The Illinois Republican has been traveling in Asia this week, and a spokeswoman hasn't immediately returned a phone message left by The Associated Press.
Meantime, Hastert's campaign fund had only about 76-thousand dollars as of July First, and his campaign's Web site has recently been taken down.
Hastert bowed out as House speaker after Democrats regained their House majority in last year's elections.
He's no longer in House leadership but is active on health care issues.