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National Security Advisor H. R. McMaster arrives to attend an event where US President Donald Trump nominated Kirstjen Nielsen to be US Secretary of Homeland Security in the East Room of the White House October 12, 2017 in Washington, DC. / AFP PHOTO / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
National Security Advisor H. R. McMaster arrives to attend an event where US President Donald Trump nominated Kirstjen Nielsen to be US Secretary of Homeland Security in the East Room of the White House October 12, 2017 in Washington, DC. / AFP PHOTO / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

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    Sources: McMaster could leave White House

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Sources: McMaster could leave White House

US National Security Adviser H.R. McMaster could leave the White House following tension with President Trump, sources say. CNN's Barbara Starr reports.

Sources: McMaster could leave White House

US National Security Adviser H.R. McMaster could leave the White House following tension with President Trump, sources say. CNN's Barbara Starr reports.