Mrs Clinton, who ran unsuccessfully to be president in 2016, said that in a parliamentary system a woman can prove her worth to colleagues and are more likely to rise to the top. “Whether it’s Margaret Thatcher, Indira Gandhi or Angela Merkel, you see the women who are known as women leaders who came to power in the last 50 years or so, as heading a party within a parliament,” she said. “So it was always interesting to see how women as the head of government got to that position. Because they were the head of government, but not the head of state, there was somebody else to fill all the ceremonial roles, but when you run for president, you’re head of both. So people are judging you, not just ‘can she do the job, does she look like the head of state?’.