Proud Boys have adopted Fred Perry polo shirts as their uniform and many members have the name of the group tattooed on their arms

Asked if he would speak to Ms Warren about her tax plans, he said: “You know I’m not sure how open minded minded she is.

Mr Gates also said he would not make “political declarations” about who he would vote for if the choice was between Donald Trump and Ms Warren.

“But I do think no matter what policy somebody has in mind, a professional approach is even – as much as I disagree with some of the policy things that are out there, I do think a professional approach to the office – whoever I decide would have the more professional approach in the current situation probably will weigh, is the thing that I will weigh the most.