Nikki Haley resigns as United Nations ambassador, Trump accepts

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The administration has a list of names and Mr Trump expected a decision in "two or three weeks" in naming a successor.

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".

But the Post's John Hudson speculates Haley's opposition also could've driven her departure.

Ivanka is rumored to be a moderating influence on her father, and is said to have angered right-wingers by encouraging him to water down some of his more socially conservative proposals.

President Donald Trump tweeted that he has a "big announcement with my friend Ambassador Nikki Haley in the Oval Office at 10:30 a.m". He said that she had done a "fantastic job" and would leave at the end of the year.

The announcement was news to many congressional Republicans involved in foreign policy matters, and some key US allies did not get advance word from Haley or the White House. Haley and Trump tangled before he won the 2016 presidential race.

Congressional and Trump administration officials told the AP that Haley plans to resign. "No, I am not running for 2020." she said.

Nearly two years into the job, Ms Haley said it was just time to let someone else step in.

Haley was appointed to the UN post in November 2016 and last month coordinated Trump's second trip to the United Nations, including his first time chairing the UN Security Council.

Haley has pressed for a hawkish line on Iran, justified USA cuts to foreign assistance and earlier this year led the United States in bolting from the UN Human Rights Council, accusing it of bias against Washington and Israel.

Former Office of Government Ethics Director Walter Shaub noted on Twitter Tuesday that Haley's resignation came after CREW filed its complaint. She was re-elected in 2014. In announcing her resignation alongside President Donald Trump in the Oval Office on Tuesday, Haley knocked down any thought that she would run for president in 2020, saying she would be campaigning for Trump. "As a private citizen, I look forward to supporting your re-election as President, and supporting the policies that will continue to move our country toward even greater heights".

She often clashed with her first boss, Secretary of State Rex Tillerson, whose aides wanted her to first clear her public remarks with Washington. Haley's op-ed was headlined, "When I challenge the president, I do it directly".