Trump endorsements face fresh test in South Carolina House primaries

Two incumbent House Republicans from South Carolina could fall to primary challengers Tuesday after running afoul of former President Donald Trump.

The races in the Palmetto State’s 1st and 7th Congressional Districts will be among the most closely watched on a day when voters also go to the polls in Maine, Nevada and North Dakota. A special House primary will also be held in Texas’ 34th Congressional District.

In South Carolina’s 1st District, freshman GOP Rep. Nancy Mace is facing Trump-backed former state Rep. Katie Arrington, who unsuccessfully contested the...