President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE early Monday slammed Republican West Virginia Senate candidate Don Blankenship, urging voters to cast their ballots for the other two GOP challengers in the race.

“To the great people of West Virginia we have, together, a really great chance to keep making a big difference,” the president wrote on Twitter.

“Problem is, Don Blankenship, currently running for Senate, can’t win the General Election in your State...No way! Remember Alabama. Vote Rep. Jenkins or A.G. Morrisey!” he added, referring to Rep. Evan Jenkins (R-W.Va.) and state Attorney General Patrick Morrisey.

To the great people of West Virginia we have, together, a really great chance to keep making a big difference. Problem is, Don Blankenship, currently running for Senate, can’t win the General Election in your State...No way! Remember Alabama. Vote Rep. Jenkins or A.G. Morrisey! — Donald J. Trump (@realDonaldTrump) May 7, 2018

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Trump’s remarks come ahead of the state's primary on Tuesday, when Blankenship, Jenkins and Morrissey will face off for the Republican Senate nomination.

Blankenship, a former coal CEO who spent time in jail for violating mining safety regulations, recently attacked Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) and his family in an ad, referring to McConnell’s “China family.”

"Swamp captain Mitch McConnell has created millions of jobs for China people. While doing so Mitch has gotten rich. In fact his China family has given him tens of millions of dollars," Blankenship said in the ad, released last week.

Meanwhile, Morrissey attacked Blankenship over the weekend, accusing him of not filing a personal financial disclosure form.

The winner of the Tuesday primary will likely face incumbent Sen. Joe Manchin Joseph (Joe) ManchinThe Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (D) in the November general election.