Washington: Barack Obama confidant Susan Rice, the former US Ambassador to the United Nations, has joined the White House as the National Security Advisor (NSA) to the United States President.

Rice (48), who replaces Tom Donilon in her new capacity as NSA, would be the top advisor to Obama on all national security and foreign policy matters.

"Truly honoured to have served the President for the last 4.5 years at the UN & excited to begin as White House National Security Advisor," Rice wrote on Twitter.

"Susan exemplifies the finest tradition of American diplomacy and leadership," Obama said on June 5 at the Rose Garden of the White House when he announced to appoint Rice for his top national security post.

"With her background as a scholar, Susan understands that there is no substitute for American leadership. She is at once passionate and pragmatic. I think everybody understands Susan is a fierce champion for justice and human dignity, but she's also mindful that we have to exercise our power wisely and deliberately," he said.

"Having served on the National Security Council staff herself, she knows how to bring people together around a common policy and then push it through to completion," Obama said.

"She knows our policies are stronger when we harness the views and talents of people across government. So Susan is the consummate public servant -- a patriot who puts her country first. She is fearless; she is tough," he said.

Rice is well known for advocating strong relationship with India. As the US Ambassador to the UN, Rice maintained a close personal relationship with Hardeep Puri, the then Indian Ambassador to the UN, when India was a member of the UN Security Council for two years.

Last August, she had travelled to India on a family vacation, during which she met top Indian officials including the National Security Advisor, Shivshankar Menon.


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