Updated 4:55 p.m. ET

Nikki Haley is resigning as the U.S. ambassador to the United Nations and will leave the Trump administration at the end of the year, she said Tuesday.

It is not immediately clear what prompted the move. She informed her staff Tuesday, NPR's Michele Kelemen reports.

Haley appeared with President Trump on Tuesday morning at the Oval Office, where he called her a "fantastic person" and said Haley had told him six months ago that she might take time off at the end of the year.

Copyright 2018 NPR. To see more, visit http://www.npr.org/.

In his latest book, Michael Beschloss details the windup to eight wars — and the executive branch involvement in each.

With the exception of the Korean War, all of these wars received either a formal congressional declaration of war (the War of 1812; the Mexican-American War in 1846; the Spanish-American War in 1898; WWI in 1917; and WWII in 1941-42) or some form of congressional authorization (Civil War in 1861 and the Vietnam War in 1964).

Support for Check It Out comes from Avery Brothers.

Copyright 2018 NPR. To see more, visit http://www.npr.org/.

Copyright 2018 NPR. To see more, visit http://www.npr.org/.

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