U.S. Ambassador to the United Nations Samantha Power Samantha Jane PowerSupport swells for renaming Edmund Pettus Bridge in Selma to honor John Lewis after his death 'Obamagate' backfires: Documents show Biden, Obama acted properly 'Unmaskings' may be common — and that's the problem MORE warned in her exit memo that a retreat from the U.N. will be harmful to U.S. national security interests.



"Other nations will follow us if we continue to lead; without our leadership the vacuum on the global stage will prove very harmful to U.S. interests," Power wrote in the memo.



"As Russia continues to menace our allies and attempt to interfere in political systems in Europe and beyond, we will need to show broad condemnation of these actions," the diplomat added.



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"As to the U.N., things will be different after Jan. 20th," Trump tweeted in December, following that U.N. Security Council vote.

As to the U.N., things will be different after Jan. 20th. — Donald J. Trump (@realDonaldTrump) December 23, 2016

In her exit memo, Power argued that a leading role in the U.N. is crucial for the United States when it comes to addressing a multitude of challenges facing the country, including the North Korean nuclear program, peace talks in Syria and climate change."Working with the U.N. to address these challenges will not be a litmus test of whether one is committed to international norms and institutions or not — it will simply be a strategic necessity," Power wrote.