National security adviser

He will replace Lt Gen Michael Flynn who was fired after just three weeks and three days in the job.

A lieutenant general with the US Army, HR McMaster served in Iraq and Afghanistan, where he worked on a government anti-corruption drive.

Mr Trump's first choice, retired Vice Admiral Robert Harward, turned down the role, citing "personal reasons".

Who is Lt Gen HR McMaster?

He has selected four candidates: adviser Keith Kellogg; former UN ambassador John Bolton; Lt Gen H R McMaster; and Lt Gen Robert Caslen.

The role became vacant when Lt Gen Michael Flynn was fired after just three weeks and three days in the job.

Mr Trump's first choice, Retired Vice Admiral Robert Harward, turned down the role, citing "personal reasons".

Gen Flynn stepped down after misleading Vice-President Mike Pence over his conversations with Russia's ambassador to the US.