Two of former U.S. President Donald Trump’s Republican rivals are trying to steer potential voters in their directions ahead of the Iowa Caucuses. Rosemary Church speaks with CNN Senior Political Analyst Ron Brownstein about how they’re doing against the former president.Two of former U.S. President Donald Trump’s Republican rivals are trying to steer potential voters in their directions ahead of the Iowa Caucuses. Rosemary Church speaks with CNN Senior Political Analyst Ron Brownstein about how they’re doing against the former president.