In 1987 Uunied States President Ronald Reagan spoke at the Berlin Wall. In his speech he called on the leader of the Soviet Union, Mikhail Gorbachev to "Tear down this wall".

The famous words were met with applause and cheers by the large crowd of West Berliners who had lived in a divided city since 1961 when the wall was built.

However, that phrase was very nearly omitted from the address. The speechwriter, Peter Robinson, tells Tim O’Callaghan what happened.

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(Photo: Ronald Reagan speaking outside the Berlin Wall and Brandenburg Gate in 1987, Credit: MIKE SARGENT/AFP via Getty Images)