FIRST ON FOX: Some Senate Republicans worry that their secret weapon on the campaign trail, President Donald Trump, isn’t making a strong enough case to voters that there needs to be more Republicans in the upper chamber.There are only a handful of primary races left between now and November, when the balance of power in the Senate could slip from the GOP’s grasp, with several seats on the line and Senate Democrats hungry to regain control.And there’s a major issue bogging Republicans down that has spurred internal animosity: the SAVE America Act. Trump’s pressure to pass the election integrit...