The latest shakeup of the White House leadership comes as the feud between Priebus and the new Communication Director Anthony Scaramucci went nasty over the past few days, hogging the media limelight.
Nick Ayers, the 36-year-old chief of staff to the vice-president Mike Pence, is Kelly's likely successor.
Scaramucci, 53, put in his papers just hours after General Kelly (retired) was sworn by Trump as the new White House Chief of Staff.
Prominent Indian-American Republican leader Nikki Haley has said that she thinks she can be the "new leader" who can take the country in a new direction and the United States cannot have a second term under Joe Biden as president.
Bannon also denied that he was fired from the key position.
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The US president tweeted on Friday that Mulvaney "has done an outstanding job" in his administration and would take over from John Kelly in the new year.
US Customs and Border Protection Commissioner Kevin McAleenan will replace Nielsen as the acting Department of Homeland Security Secretary.
The two leaders spoke over phone to discuss the escalating tension after Kim threatened the US this week to fire missiles at Guam, a US island territory, after the US sponsored a resolution imposing new economic sanctions on Pyongyang over its missile and nuclear weapons programmes.
Denuclearising North Korea and stopping Iran from obtaining nuclear weapons are the goals of the US, said Trump.
Trump again denies any collusion between the Trump campaign and the Russians.
Haley, in her forthcoming memoir, has claimed that former Secretary of State Rex Tillerson and former White House chief of staff John Kelly attempted to recruit her to undermine President Trump in an effort to "save the country," according to The Washington Post.
Mexico fights back, says it will 'not pay for any wall'
Trump's former campaign manager Paul Manafort was on Monday charged with conspiracy against the US.
The suit alleges that Acosta and CNN's First and Fifth Amendment rights are being violated by the ban.
The US president was received by Lee at the presidential palace Istana, where they were expected to discuss everything from the summit preparations to America's tariff threats.
Bikkannavar is a US citizen and is working with NASA for 10 years. In addition, he has never visited the countries on the immigration ban.
Mattis applauded India's efforts to promote stability in the South Asia region, said Pentagon Spokesperson
Cohn served as Trump's chief economic advisor since the beginning of the Administration. During his stay at the White House, he led coordination of Trump's pro-growth domestic and global economic policy agenda, including the passage of historic tax cuts and reforms in December 2017, the official said.
The Trump administration has a "very positive view" of the Indo-US relationship and a lot of interest in taking the ties forward, Foreign Secretary S Jaishankar said on Saturday after his wide-ranging talks with senior Cabinet members and top officials in Washington.
Friday is the last day for White House Chief strategist Steve Bannon, a presidential spokesperson said on Friday.
On Saturday in Washington, DC -- where for more than 30 years he represented the state of Arizona and earned a reputation in Congress as a "maverick" -- late United States Senator John McCain was honoured by friends, loved ones, and even onetime political rivals. Former US presidents Barack Obama and George W Bush, both of whom McCain had challenged in their races to win the nation's highest office, delivered eulogies during the service at Washington National Cathedral. In doing so, they underscored the respect McCain commanded throughout his life for his service and bravery, from his years as a Vietnam War prisoner of war to his last days battling brain cancer. Here, touching photos from the service, part of a five-day series of memorial events before McCain's body is laid to rest on Sunday at the US Naval Academy Cemetery.
The announcement of McMaster's ouster, who the White House said had a "good working relationship" with Trump, is the latest in a string of high-profile White House departures since President Trump took office in January 2017.
Presence of terror safe havens in Pakistan, aggressive Chinese behaviour and the Afghanistan situation dominated last month's meeting between James Mattis and National Security Advisor Ajit Doval
Since the change in administration in the US, Indian leaders have publicly and privately identified with American objectives in Afghanistan.
Even before assuming the United States President's office, Donald Trump has boasted about his election victory, his re-election prospects, re-prided himself for picking a "great" Cabinet and showered confidence on the capabilities of his son-in-law to broker peace in the volatile Middle East.
US President Donald Trump triumphantly greeted supporters at the first of the three inaugural balls, joining his First Lady on stage to tell them: 'We did it."
Incoming US President Donald Trump has assembled a core team that is -- not surprisingly -- overwhelmingly white and male.