J.D. Hayworth continues to tease about his possible 2010 political ambitions.

Hayworth, who became a radio talk show host after losing his 2006 House re-election bid, has been talking about possibly challenging Sen. John McCain, R-Ariz., in next year's GOP Senate primary.

On his KFYI radio show Monday, Hayworth told his listeners that he went to Washington, D.C., this month and "we may have moved past due diligence into something that is more than a legal term of art ... something called 'testing the waters.' So stay tuned on that."