Wisconsin Gov. Scott Walker spoke from London on Wednesday on the trade issues driving current overseas trip, but brushed aside questions on ISIS policy, his presidential aspirations in 2016 and even evolution, NBC News reported. In his appearance at a London think-tank, Walker declined press questions about the U.S. fight against ISIS, citing the political tradition of not commenting on policy while traveling outside the United States. Walker has said he is in the U.K. to strengthen ties between Wisconsin and U.K. businesses, following in the footsteps of New Jersey Gov. Chris Christie, who went on a similar mission last week.