President Donald Trump heads Monday to Mississippi, as he continues a closing midterm campaign blitz that highlights Republicans' challenges ahead of an election that could drastically shift power in Washington and statehouses across the country.

Vivek Ramaswamy’s campaign is moving to a shorter version of its controversial attack ad against Democratic gubernatorial nominee Amy Acton, removing some of the most explosive claims made by Acton’s estranged mother while continuing to use her to challenge Acton’s credibility. The new 30-second ad eliminates Donna Arthur’s assertion that Acton “lies about her past,” including Acton’s accounts ...