It is believed the man had been waiting for the Prime Minister to arrive in order to ask him questions.
"The question I asked your Prime Minister tonight was that he has been accused of personal involvement in a huge corruption scandal.
"He’s given some answers but I know that from many Malaysian friends and journalists the answers he’s given are inadequate,” said the man, who identified himself as Jonathan Miller, the Asian correspondent for UK's Channel 4 News.
Speaking to reporters outside the building after he was ejected, the man said he wanted Najib to respond to his questions.
"I know it might seem a little unfair as he’s just won an election, I just want to ask him this important question which I believe the Malaysian people needs a proper response.”
Asked by a reporter whether he has obtained accreditation to cover the election, Miller said he believed that he need not apply for a filming permit.