How Trump’s Crushing Primary Triumph Masked Quiet Weaknesses

Donald J. Trump’s daunting level of Republican support helped him vanquish a field of presidential primary rivals in under two months.

But he still hasn’t won over one small but crucial group of voters — the men and women who cost him a second term in 2020.

His overwhelming primary victories, including more than a dozen on Tuesday that pushed Nikki Haley from the race, have masked his long-term problems with voters who live in the suburbs, those who view themselves as moderates or independents, and Republicans who backed Joseph R. Biden Jr. in 2020.