Reproductive Freedom for All, formerly known as NARAL Pro-Choice America, is backing the Democratic congressman over the independent Arizona senator.

A powerful abortion-rights group is throwing its support behind Democratic Rep. Ruben Gallego in the Arizona Senate race after having backed Democratic-turned-independent Sen. Kyrsten Sinema in her last election.

Reproductive Freedom for All, formerly known as NARAL Pro-Choice America, a key organization that funds candidates who support abortion rights, is officially endorsing Gallego on Wednesday, it said in an announcement first shared with NBC News.

Gallego announced his run against Sinema in January, after she left the Democratic Party and became an independent late last year. Sinema has not publicized her re-election plans yet, but she has been preparing to run again, including quietly pitching herself to donors, NBC News has reported.