Former national security adviser says the UK needs to be "willing" to deploy troops for potentially quite a long period.
Former Cabinet Secretary Lord Mark Sedwill was speaking on Sunday with Laura Kuenssberg.
Lord Sedwill told the Covid inquiry there had been a loss of confidence in the former health secretary.
Chris Bryant and Julian Lewis are among the political figures recognised in the New Year Honours list.
People who say Boris Johnson does not want Joe Biden as president are "mistaken", says Lord Sedwill.
Lord Sedwill is "flattered" to be a candidate, but admits a politician is more likely to get the job.
