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(CNN) — President-elect Joe Biden will nominate Pete Buttigieg to be his transportation secretary, sources familiar with the matter tell CNN, elevating the former South Bend, Indiana, mayor, and 2020 Democratic presidential candidate to a top post in the federal government.

Buttigieg would be the first Senate-confirmed LGBTQ Cabinet secretary should his nomination make it through the chamber.

The choice vaults a candidate Biden spoke glowingly of after the Democratic primary into a top job in the incoming administration and could earn Buttigieg what many Democrats believe is needed experience should he run for president again.

The role of transportation secretary is expected to play a central role in Biden’s push for a bipartisan infrastructure package.

Buttigieg emerged as the leading candidate for the transportation secretary role in recent days. The former mayor was considered for a host of other posts, including US ambassador to the United Nations and commerce secretary.

Other Democrats were also considered for the post, including former Chicago Mayor Rahm Emanuel, Los Angeles Mayor Eric Garcetti, and Rhode Island Gov. Gina Raimondo.

After ending his presidential campaign earlier in the year, Buttigieg endorsed Biden and spent much of the general election headlining fundraisers and events for the former vice president.

Prior to running for president, Buttigieg had served as the mayor of South Bend since 2012. He did not seek reelection in 2019.

During his tenure as mayor, Buttigieg in 2014 deployed to Afghanistan as an intelligence officer.

Prior to running for office, Buttigieg was a consultant at McKinsey & Company in Chicago.