Leading GOP pollster: Trump's focus on immigration sunk House majority

President Trump’s relentless focus on immigration in the midterm elections cost the Republican Party control of the House of Representatives, according to a blistering after-action review produced a by leading GOP pollster.

The findings from David Winston raise questions about Trump’s political position heading into 2020. That’s because the issue he most often discusses on the stump, border security and the migrant caravan, were big losers with critical voting blocs, and largely responsible for the late-breaking Democratic wave that swept Republicans from power in the House, according to Winston.