She gave no reason for her departure after two years, though there has been speculation she will return to government or politics at some point.
Trump said Haley would help select her replacement, and called her a "great friend" who did a "fantastic job". "We've solved a lot of problems and we're in the process of solving a lot of problems".
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Haley surprised almost all White House watchers on Tuesday, announcing she was leaving her job on East River.
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Trump said he would name her successor in the next two to three weeks.
Haley, a rookie to global politics, was an unusual pick for to be United Nations envoy. "Countries may not like what we do, but they respect what we do", Haley said. Trump unceremoniously announced his firing of former secretary of state Rex Tillerson in March in a tweet.
And image-obsessed President Trump did little to dampen rumors of a promotion for Ivanka after praising Haley for making the role 'a much more glamorous position'.
Ms Haley added that nations around the world had also been convinced that Mr Trump "means business".
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Although Nurmagomedov enters the event as champion, McGregor had the belt prior to him and never was dethroned inside the octagon. This fight with Nurmagomedov being the first on the agreement. "Get him in the sauna and cook him like the little rat he is".
Sanford, who served as the governor of SC before Haley, also said that he believes it's possible that Haley might be part of a political shake-up that includes Lindsey Graham taking over Jeff Sessions' role as attorney general, saying "those dots connect".
But she said in her resignation letter to Trump she would "surely not be a candidate for any office in 2020" and would support his re-election bid. All three men are CEOs of private companies based in SC.
During her tenure as UN Ambassador, Ms Haley has been considered to be one of Mr Trump's most trusted advisers. However, the previously mentioned scandals may serve as a bit of a roadblock in her effectiveness as a campaigner.
The daughter of Indian immigrants, Haley had always been seen as a rising star in the Republican Party which has eagerly sought female and ethnic minorities to broaden the appeal beyond its traditional white demographic. "My goal is that we make sure that everything is in good place for the next ambassador to come in".
"I don't agree with the president on everything", Haley wrote in her September 7 op-ed.
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The Nokia 7 .1 will be available for pre-order in Europe from October 5, and will begin shipping to other markets from next week. Europeans have two choices: the 3GB/32GB variant, as well as an upgraded version with 4GB of RAM and 64GB of internal storage.