A <a href="https://thenationalnews.com/tags/texas" target="_blank">Texas</a> oil pipeline billionaire is suing Beto O'Rourke for defamation after the Democrat criticised his $1 million donation to Republican Governor Greg Abbott's campaign following last year's deadly <a href="https://www.thenationalnews.com/world/us-news/2022/02/04/winter-storm-leaves-350000-us-homes-without-power/" target="_blank">winter blackout</a>. Mr O'Rourke, who won the Democratic nomination for governor last week, called the lawsuit frivolous during a news conference on Monday. Court records show it was filed in February in rural West Texas. The donor, Kelcy Warren, is the chairman of Energy Transfer. The oil pipeline company reported $6.7 billion in net income last year, including about $2.4bn in earnings related to the catastrophic February 2021 winter storm in Texas that sent natural gas prices soaring. Four months later, Ms Warren gave the Abbott campaign $1m, his largest single political contribution in a decade, of donations to <a href="https://www.thenationalnews.com/world/us-news/2022/03/01/texas-primary-tests-republicans-rightward-shift-as-midterms-begin/" target="_blank">Republican candidates in Texas</a>, according to state campaign finance records. Mr O'Rourke has made the failure of Texas' power grid - and Mr Abbott's handling of the aftermath - a cornerstone of his underdog campaign. He has accused the two-term governor of letting energy companies off the hook by not mandating more significant industry oversight or weatherisation. Mr O'Rourke tweeted that energy executives “bought off” Mr Abbott and at times singled out Ms Warren, calling to stop the contribution during one campaign, saying “looks like a bribe to me”. The lawsuit filed in San Saba County seeks unspecified compensation. “O’Rourke intended that his malicious and baseless defamatory statements publicly humiliate Warren and discourage others from contributing to Governor Abbott’s campaign,” the lawsuit reads. Energy Transfer said comments by O’Rourke are “flat-out false.” Renae Eze, a spokeswoman for Abbott, said their campaign “is in no way involved in this lawsuit”. Before last month's primary, Mr O'Rourke spent two weeks highlighting the fallout from the winter storm in stops across Texas. He accused Ms Warren of trying to shut him down. “We're on the most solid ground possible,” Mr O'Rourke told reporters in Dallas.