The confirmation vote, 56-34, of Kelly Knight Craft, who now is USA ambassador to Canada, came hours after Senate Foreign Relations Democrats published a report that harshly criticized her suitability for the role.
Craft said that as ambassador to the United Nations she would continue Haley's efforts to fight against anti-Israel resolutions and push for reform at the world body.
Craft's supporters, however, describe her as a capable negotiator who fostered cooperation during recent trade talks between the US, Mexico and Canada. Her husband, billionaire Joseph Craft, is the CEO of coal giant Alliance Resource Partners, a company that has complained about global climate change mechanisms - including the 2016 Paris Accord.
Prior to the confirmation vote, Senator Bob Menendez, the ranking Democrat on the Senate Foreign Relations Committee implored his colleagues to reject Craft's nomination, specifically calling attention to her "rampant absenteeism" and "conflicts of interest".
"Never in our nation's history have we nominated such an underqualified person to this critical post", Menendez said.
In contrast to Craft's largely partisan confirmation vote, her predecessor, Nikki Haley was confirmed as United Nations envoy in January 2017 by an overwhelming bipartisan vote, 96-4. Haley received overwhelming support in her Senate confirmation, with the vote being 96-4 back in 2017.
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Democrats criticized Craft for a weak Senate Foreign Relations confirmation performance.
Craft, a longtime GOP activist from Kentucky, is now US ambassador to Canada.
While Haley was a member of Trump's Cabinet, the administration has since demoted the position out of the Cabinet.
Senate Majority Leader Mitch McConnell noted her service to Canada and prior United Nations work in a speech on the Senate floor prior to the vote.
Craft will have the hard job of defending Trump's "America First" foreign policy and navigating his criticism of the United Nations while getting global diplomats to back USA policies. "I have much to learn about the United Nations". "And if confirmed, I commit to seizing every opportunity to shine a light on this conduct, call it what it is and demand that these outrageous practices finally come to an end", she pledged.