washington former arkansas governor mike huckabee candidate republican presidential nomination say thursday attend event military veterans organize iowa republican front-runner donald trump cnn report new york businessman trump involve spat fox news vow skip thursday night republican presidential debate host network instead say hold event benefit military veterans cnn say huckabee would participate republican debate first go trump event report david alexander tim ryan susan heavey edit david gregorio sap sponsor coverage independently produce staff reuters news agency huckabee say attend trump event veterans iowa cnn