At Dundee Sheriff Court on Wednesday, Tracie Currie, 35, and Carl O'Brien, 25, pleaded guilty to racially abusing Mr Yousaf in the city on 25 February.

Court papers detailed how the pair repeatedly made racist remarks about the SNP leader and prejudiced comments about religion in the city's Seagate.

Following this, they directed verbal abuse towards local SNP MSP Shona Robison, who is now deputy first minister, and MP Chris Law, at the party's parliamentary office on Old Glamis Road on the same day.

The court papers said O'Brien also repeatedly phoned the Dundee SNP parliamentary office and made offensive remarks the previous day, on 24 February.

Nominations for the SNP leadership contest closed that day and Mr Yousaf was one of three candidates.

Currie pleaded not guilty to resisting arrest and struggling outside a police station on Bell Street in Dundee as well as being in possession of cocaine, which the court accepted.

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O'Brien denied a further charge of threatening and abusive behaviour, which was accepted by the court.

Sheriff Alastair Carmichael extended the bail for Currie and O'Brien and they will appear in the dock again on 3 October.