Transcript for Trump urges voters to reject Blankenship on West Virginia ballot

And now, to the primary showdown in four states tonight. Indiana, Ohio, West Virginia and North Carolina, and it comes, of course, ahead of November's crucial midterms. It was last night here we reported on one West Virginia senate candidate, don Blankenship, a former coal mining executive. You'll remember that deadly disaster in his coal mine. He now says it was caused by the federal government. Tonight, ABC's chief national affairs correspondent Tom llamas, right there on the ground, and one voter telling Tom that he lost family members in that mine, still voting for Blankenship. Reporter: Tonight, he's on parole and on the ballot in west Virginia. I'm basically trumpier than trump. Reporter: But the feeling's not mutual. President trump urging voters to reject coal baron don Blankenship, tweeting, "Can't win the general election in your stay. No way." Mcconnell has to go, to drain the swamp. Reporter: Blankenship has been accused of race baiting when he attacked the wife of Mitch Mcconnell, transportation secretary Elaine Chao in this campaign ad. Mitch has gotten rich. In fact, his China family has given him tens of millions of dollars. Reporter: Were you trying to inject race into the discussion here? We've lost nearly half our jobs in West Virginia and they went to China. Reporter: Blankenship released from prison last year, blamed in part for 29 of his miners who died in the upper big branch explosion. Within the past 24 hours, he repeated his claim it's the federal government that is to blame, because he says regulators made bad decisions about cutting air in the mine. You had cousins who died in that mine disaster? Three of them. Reporter: Three died in that mine disaster and you're going to vote for Blankenship? Exactly. I want an honest crook, and that's Blankenship. Let's get to Tom llamas tonight, he's at Blankenship's headquarters. Leaders concerned that Blankenship is surging. Reporter: That's right. The real fear started after last week's debate, where Blankenship really took a page out of president trump's playbook. He said, if he wins it all, he will support president trump. David? Tom llamas, thank you. There is still much more ahead on "World news tonight" this Tuesday.

This transcript has been automatically generated and may not be 100% accurate.