A Democratic senator sent a warning to Donald Trump Saturday: if Hillary Clinton is killed “the blood will be on your hands.”

Sen. Chris Murphy (D-CT) took to Twitter to condemn Trump’s comments about disarming Clinton’s bodyguards and seeing “what happens,” tweeting Trump directly with his warning.

Hey @realDonaldTrump, if you keep suggesting your supporters kill @HillaryClinton, someone will listen. The blood will be on your hands. — Chris Murphy (@ChrisMurphyCT) September 17, 2016

Murphy previously criticized Trump’s “Second Amendment people” remark, saying it qualified as an assassination threat and calling for a Secret Service investigation, according to The Hill.

Murphy is not the only Democrat speaking up. Former Arizona congresswoman Gabby Giffords, who survived her own assassination attempt, released a statement on Twitter condemning the comments and calling Trump “reckless” and “irresponsible.”

Tonight we saw yet again just how unfit @realDonalTrump is to be president. https://t.co/RZQ22BvcQ8 pic.twitter.com/AqioacO01o — Gabrielle Giffords (@GabbyGiffords) September 17, 2016

Trump has not spoken out publicly about the comment since the event.