Joe Biden boasted of a "cabinet of barrier breakers" Wednesday as the US President-elect introduced his transportation secretary pick Pete Buttigieg, who if confirmed would become the first openly gay head of a cabinet-level department.
Mr Buttigieg, whom Mr Biden called "a policy wonk with a big heart," is one of several trailblazing picks by the veteran Democrat who appears to be following through on his pledge to name the most diverse US cabinet ever.
"A cabinet that looks like America" is how Mr Biden, 78, described the inner circle that he is putting together.
"We'll have a cabinet of barrier breakers, a cabinet of firsts," he told reporters in Wilmington, Delaware, noting that eight "precedent-busting appointments" were already made.
Vice President-elect Kamala Harris is among the historic picks, being the first woman and first person of colour elected to the post.
Others include retired general Lloyd Austin, who would be the first Black secretary of defence, and Janet Yellen, the first woman to lead the Treasury Department.
"And today a ninth, the first-ever openly gay nominee to lead a cabinet department (and) one of the youngest cabinet members ever," Mr Biden said.

Democratic presidential candidate Pete Buttigieg accepts a bracelet from Zachary Ro, who asked the former mayor to help him tell others he is gay. Source: Getty Images
Mr Buttigieg, a former small town Indiana mayor who turns 39 one day before Mr Biden is inaugurated on 20 January, was like Ms Harris, a rival of Mr Biden's on the 2020 presidential campaign trail.
When he dropped out of the race he quickly endorsed Mr Biden, who at the time compared Mr Buttigieg to his own late son Beau Biden.
The President-elect hailed Mr Buttigieg, who put his mayoral duties on hold to serve as a US Navy intelligence officer in Afghanistan, as a "next-generation leader" who will bring critical problem-solving skills to the challenge of improving the country's ailing infrastructure.
As a millennial, Mr Buttigieg said, he and his generation have much at stake in improving "how America will look by the middle of this century".
But he also acknowledged the history-making nature of the appointment of the first member of the LGBTQ community to a presidential cabinet.
He noted he proposed to his now-husband Chasten, a teacher and writer, at an airport in Chicago.

Pete Buttigieg with his husband Chasten Glezman in 2019. Source: AP
"Don't let anybody tell you that O'Hare isn't romantic," he quipped.