Lily Allen joined protestors outside the US embassy in London on Friday. The artist delighted crowds as she performed "Going to a Town" by Rufus Wainwright.
Allen was recently attacked by the far right on social media for showing solidarity with refugees in the Calais refugee camp.
The event of over 2000 people was one of over 25 protests around the country including one of over 1000 in Glasgow and 500 in Manchester, all under the slogan #StandUpToTrump.
Kate Hudson, General Secretary of the Campaign for Nuclear Disarmament warned of the fact that Trump now has his finger on the red button and has already called for the US to expand its nuclear arsenal.
Other speakers included Fevzi Hussain representing the GMB Race Committee, the Rainbow Coalition's Denis Fernando and Susan Jeffreys representing the Campaign against Climate Change.
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