The Bullring has locked its doors as a precaution as 100 people protest outside.
Police are monitoring the demonstration, for which people have been gathering since 3.00pm today.
"As a precautionary measure Bullring has locked its external doors after consultation with the police due to a protest currently taking place on Rotunda Square. As always our primary concern is the welfare of our shoppers and retailers."
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Speaking on the BBC's Andrew Marr Show, he said that voters may not have got to know Mr Nuttall well enough.
It will start to become wet and windy.
Some rain tonight, but turning drier by the morning.