(CNN) - U.S. Ambassador to the United Nations Samantha Power said she has regretted calling then-Sen. Hillary Clinton a "monster" nearly every day since she made the comment in the 2008 primary battle when Power worked as an adviser to then-Sen. Barack Obama's presidential campaign.
"There is a fair amount of negativity heaped upon her that I find massively unfair. And the idea that I could have contributed in some way to that narrative...that was terrible. So yeah, I have regretted it pretty much every day since," she said in an interview that aired Thursday on NBC's "Today."
Power apologized for her comments in March 2008 after they were published in a Scottish newspaper.
"She is a monster, too – that is off the record – she is stooping to anything," Power was quoted as saying.
"You just look at her and think, 'Ergh,' " Power also said. "But if you are poor and she is telling you some story about how Obama is going to take your job away, maybe it will be more effective. The amount of deceit she has put forward is really unattractive."
Power resigned from the Obama campaign after apologizing for the comments, and she apologized to Clinton personally. In the Thursday interview, she said "it was very emotional for me."
"To be able to say that in person was something that I'm immensely grateful to her to have given me that opportunity to do," she said.
Power went on to become the special assistant to the president and senior director for multilateral affairs and human rights at the National Security Council during Obama's first term. She left the administration in February and was nominated for the ambassadorship in June.
In the Thursday interview, Power said she and Clinton have "worked together very effectively on issues of common concern the last four years."