Talking to reporters after a meeting with Ms. Haley at the White House on Tuesday morning, Mr. Trump said she had done an "incredible job". Haley had expressed some frustration that her voice had been diminished as the two men became the aggressive new faces of Trump's foreign policy, the official said.
For her part, Haley thanked the president for what she called the "honor of a lifetime" and praised the president's performance over the past two years, saying "the U.S.is strong again in a way that should make all Americans proud".
"By accepting gifts of luxury private flights, Ambassador Haley seems to be falling in line with other Trump administration officials who are reaping personal benefits from their public positions", CREW Executive Director Noah Bookbinder said in a Monday statement.
Haley, whose given name was Nimrata Randhawa, was elected governor in 2010 of deeply Republican South Carolina and, during the 2016 campaign, had criticized Trump over his remarks on immigrants before their political reconciliation.
In April, she clashed with the White House when a Trump aide suggested she had prematurely announced a new round of sanctions against Russian Federation.
One of the most prominent members of the Trump administration, U.N. Ambassador Nikki Haley has resigned today.
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But on one issue that raised speculation, Ms Haley dismissed any presidential run against her current boss in 2020.
Calling Mr Trump's adviser and son in law Jared Kushner a "hidden genius", Ms Haley said the "Middle East peace plan is so unbelievably well done".
At least that's what CNN was speculating as President Trump confirmed Haley's resignation on Tuesday, adding that she would leave the post at the end of the year to "take a break". "Look at the chemical weapons in Syria", Haley said.
"I don't see (my role) as pushing an "America First" policy, I see it as defending America because every day I feel like I put body armor on".
"I proudly serve in this administration, and I enthusiastically support most of its decisions and the direction it is taking the country", Haley wrote. Axios first reported Haley's resignation. She was re-elected in 2014.
She is one of the most popular politicians in the United States, liked by her staff and has built a good rapport with global colleagues. Haley's op-ed was headlined, "When I challenge the president, I do it directly".