Alex Soros, son of Democratic Party megadonor George Soros, endorsed Vice President Kamala Harris to be President Joe Biden‘s replacement at the top of the Democratic ticket, after the president dropped out of the race.

Soros is chair of Open Society Foundations, one of the top left-leaning grantmaking networks in the country which was founded by his father George, and has helmed the left-wing dark money group since his father handed over the reins last year. He had called on Democrats to stop the infighting over Biden’s candidacy, while the president faced pressure to step aside. Now that Biden has dropped out and endorsed Harris, Soros called on Democrats to unite behind the vice president.