Former White House chief strategist Steven Bannon declared “war” on the GOP establishment at the conservative Values Voter Summit on Saturday. Bannon is reportedly planning to back a slate of primary challengers to incumbent Republican senators next year.

The FiveThirtyEight Politics podcast team considers which senators might be most at risk from a primary challenger and how Bannon’s influence could affect the 2018 midterms overall. The crew also discusses the political impact of President Trump’s decision to halt subsidies that help low-income people pay for health insurance through the Affordable Care Act marketplaces.

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