New Jersey Democratic Sen. Cory Booker, who will break Senate tradition and testify against the confirmation of a colleague for a cabinet post, once praised GOP Alabama Sen. Jeff Sessions for working with him to honor civil rights activists.

Booker will testify against Sessions’ confirmation as attorney general. He told MSNBC’s Chris Hayes Monday night that he has serious concerns about Sessions’ civil rights record.

Just last year in February 2016, Sessions partnered with Booker to award the Congressional Gold Medal to those who participated in the 1965 Voting Rights March from Selma to Montgomery, Ala. (RELATED; Cory Booker Will Testify Against AG Nominee Jeff Sessions)

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“I feel blessed and honored to have partnered with Sen. Sessions in being the Senate sponsors of this important award,” Booker said during the award ceremony.

Booker is believed to be the first sitting senator to testify against the confirmation of a colleague to a cabinet post. He is often discussed as a potential Democratic presidential candidate in the 2020 election.

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