The civil rights leader’s son said the GOP gubernatorial nominee’s alleged remarks are concerning to all Americans who oppose racism and bigotry.

Mr. Robinson, the Republican nominee for governor of North Carolina, vowed to stay in the race and sought to deny the report, which also said he had defended slavery in online posts years ago.

He wished he could join the KKK, supported slavery, and bashed Martin Luther King Jr., all on an old porn website where he used to write.