Multiple Democratic presidential candidates tweeted in support of Transgender Day of Remembrance on Wednesday.

Among those to tweet were former Vice President Joe BidenJoe BidenHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Trump finalizing executive order calling on police to use ‘force with compassion’ The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook MORE, Sens. Elizabeth WarrenElizabeth WarrenWarren, Democrats urge Trump to back down from veto threat over changing Confederate-named bases OVERNIGHT DEFENSE: Joint Chiefs chairman says he regrets participating in Trump photo-op | GOP senators back Joint Chiefs chairman who voiced regret over Trump photo-op | Senate panel approves 0B defense policy bill Trump on collision course with Congress over bases with Confederate names MORE (D-Mass.), Bernie SandersBernie SandersThe Hill’s 12:30 Report: Milley apologizes for church photo-op Harris grapples with defund the police movement amid veep talk Biden courts younger voters — who have been a weakness MORE (I-Vt.), Cory BookerCory Anthony BookerRand Paul introduces bill to end no-knock warrants Black lawmakers unveil bill to remove Confederate statues from Capitol Harris grapples with defund the police movement amid veep talk MORE (D-N.J.), Kamala HarrisKamala Devi HarrisRand Paul introduces bill to end no-knock warrants The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook McEnany says Juneteenth is a very ‘meaningful’ day to Trump MORE (D-Calif.), former Housing and Urban Development Secretary Julián Castro and South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegScaled-back Pride Month poses challenges for fundraising, outreach Biden hopes to pick VP by Aug. 1 It’s as if a Trump operative infiltrated the Democratic primary process MORE.

Several of the candidates referenced the fact that 22 transgender Americans have been killed this year.

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Castro stated that “91% of murdered transgender people are Black trans women,” and “34% of Black trans women live in extreme poverty.”

“Hateful acts of anti-trans violence have claimed far too many lives—many whose names we’ll never know,” Booker said in his tweet.

“Today we honor them,” he continued. “To those who continue to face discrimination & violence due to transphobia: I see you, I love you, & will never stop fighting for you.”

Transgender Day of Remembrance was first observed in 1999 by transgender advocate Gwendolyn Ann Smith to honor Rita Hester who was killed in 1998. The day is the culmination of Transgender Awareness Week.