“Top Republicans are growing increasingly anxious that the Senate, once seen as a lock for the party to hold in the midterms, is at risk of flipping as Democrats continue to hammer President Donald Trump for the cost of living and foreign intervention in Iran,” Politico reports.“That fear is laid out in a new memo, from the powerful GOP and Koch-aligned super PAC Americans for Prosperity Action, whose leaders are calling on the GOP to lock in on the cost of living or risk losing power in Washington.”