In a statement Saturday, Haley said that then-President Obama's decision to commit the USA to the process by signing the non-binding New York Declaration for Refugees and Migrants in September 2016 had come at the expense of America's interest.
Nikki Haley, the U.S. Ambassador to the United Nations, said that "America is proud of our immigrant heritage and our long-standing moral leadership in providing support to migrant and refugee populations across the globe".
The Trump administration has pulled out of the United Nations' ambitious plans to create a more humane global strategy on migration, saying involvement in the process interferes with American sovereignty, and runs counter to USA immigration policies.
'We will decide how best to control our borders and who will be allowed to enter our country, ' she said.
The US has been a part of the New York Declaration for Refugees and Migrants since it was formed a year ago.
The US supports "international cooperation on migration issues", the statement added, "but it is the primary responsibility of sovereign states to help ensure that migration is safe, orderly, and legal".
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The United States has withdrawn from a United Nations pact to improve the handling of migrant and refugee situations, deeming it "inconsistent" with its policies.
U.N. Secretary-General Antonio Guterres regretted the USA decision, his spokesman said on Sunday, but expressed hope the United States might re-engage in the talks.
He added that the U.S. "has the experience and expertise to help ensure that this process leads to a successful outcome".
"I regret [the] U.S. decision to disengage from [the] process leading to a United Nations global compact on migration", Miroslav Lajcak tweeted after the decision was announced.
Migrant-rights advocates expressed a mix of shock and bafflement at the Trump administration's announcement, asserting that nothing proposed in the Global Compact would be mandatory.
US AMBASSADOR NIKKI HALEY, on decisions over immigration policies.
"Our decisions on immigration policies must always be made by Americans and Americans alone", she said.