US filmmaker Michael Moore has challenged Republican presidential candidate Fred Thompson for a debate over health care issues. Both of them have been taking a dig at each other ever since Thompson wrote in the National Review on May 2, an article on the Treasury Department's investigation into whether Moore violated the US trade embargo against Cuba by seeking free treatment for 9/11 responders there. Moore has now blasted Thompson in a letter over his fondness for Cuban-made Montecristo cigars. "While I will leave it up to the conservatives to debate your hypocrisy and the Treasury Department to determine whether...