“I convey my warmest congratulations to President-elect Joe Biden, a friend and reliable partner in building a better Iraq,” Saleh wrote.
He stressed that Baghdad looks forward to working with Washington to "achieve common goals and strengthen peace and stability in the Middle East."
Earlier, a number of media outlets, including CNN, AP, NBC and Fox News, announced Biden's victory in the US presidential election.
Biden later declared himself the winner of the presidential election.