The move puts an end to a bitter partisan fight that has rippled across the country and that threatened to drag on through the summer. The sudden reversal also takes pressure off moderate and vulnerable Democrats who have appeared to grow increasingly uncomfortable with the possibility of voting to overturn a state-certified election.
But even as she ended her official challenge, Hart made clear Wednesday that she stands by her claims.
"Despite our best efforts to have every vote counted, the reality is that the toxic campaign of political disinformation to attack this constitutional review of the closest congressional contest in 100 years has effectively silenced the voices of Iowans," Hart said in a statement announcing the decision. "It is a stain on our democracy that the truth has not prevailed and my hope for the future is a return to decency and civility."
Miller-Meeks, who has been seated in Congress provisionally since January, issued a statement Wednesday thanking Hart for the decision.
"I know how extremely difficult it is to lose an election, but for the people to have faith and confidence in the election system and Iowa laws, it was gracious of her to concede at this time," she said. "I look forward to continuing to work to represent the people of Iowa's Second District."