Nearly two thirds of UK university students said they endorsed the National Union of Students (NUS) controversial "no plaform" policy, whereby those with opinions deemed to be offensive can be banned from speaking on student union premises.

Campaigners accused students of having gone “too far” in their implementation of the policy.

Last Friday Mr Johnson said the “part-Kenyan” president Obama had intentionally removed a bust of Winston Churchill from the Oval Office due to his “ancestral dislike of the British Empire”.

Subsequently, the student’s society whose committee is made up by King’s College London students, emailed Mr Johnson saying his “inappropriate” comments about Obama’s heritage “does not reflect the true greatness of the United Kingdom”.

Signed by King’s College Director of EU Referendum Events, Mike Molloy, it said: “Given your inappropriate comments and inferences towards President Obama’s Kenyan heritage, of which he is rightly proud, and your general tone of disrespect over the past few days in relation to the President of the United States of America, we are now formally withdrawing your invitation at Kings College London.