Iowa Republicans focused on the economy and the border. Trump dominated on both issues.

There were two main concerns from voters that fueled Donald Trump’s overwhelming victory in Iowa Monday: the economy and immigration. Nearly three in four Iowa caucus-goers on Monday night named either one of these issues as those that mattered most to them, according to an entrance poll conducted by news organizations. Those helped cement Trump's dominant performance in the Hawkeye state, as he ended up on top in 98 of the state's 99 counties. The Associated Press called the state for Trump just half an hour after the caucuses began. Trump nodded to the twin concerns in his victory speech….