After Paxton, a Republican, petitioned the U.S. Supreme Court in December to block Joe Biden’s victory, a Democratic Party activist filed a complaint with the bar association calling the case frivolous.
The bar initially declined to investigate, but a tribunal overturned that decision late last month.
The investigation is another liability for Paxton, who is facing a years-old criminal case, a newer, separate FBI investigation, and a Republican primary opponent who is seeking to make electoral hay.
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