A woman wearing a “Make America Great Again” cap became engaged in a heated row with another member of the crowd over Robert Mueller’s investigation into Russian interference in the 2016 US election.
The argument started after the woman began shouting accusations of bias and “fake news” towards the media tents.
The two then became engaged in a minute-long verbal confrontation.
The crowds waiting to see Mr Trump arrive at Buckingham Palace were largely made up of tourists.
Many were unaware of the incoming president, with just a small number of pro- and anti-Trump demonstrators.
A larger rally against Mr Trump is scheduled for Tuesday, in central London.
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