Sanders has condemned the violence and the leaders chose their words carefully to make it clear that they don't hold Sanders responsible, but their outspokenness suggests that there could be a backlash.
"This is a test of leadership as we all know and I'm hopeful and very confident that Sen. Sanders will do the right thing," said Reid, who is a Nevada Democrat himself.
Sanders released a statement on Tuesday saying party leaders in Nevada had been claiming that the Sanders campaign "has a 'penchant for violence.' That is nonsense."
"Our campaign has held giant rallies all across this country, including in high-crime areas, and there have been zero reports of violence. Our campaign of course believes in non-violent change and it goes without saying that I condemn any and all forms of violence, including the personal harassment of individuals," Sanders said.
Even though Sanders' campaign manager Jeff Weaver accused her of "working against Bernie Sanders," Wasserman-Schultz said that Sanders should stay in the race until the last ballot is cast.
In a statement, Clinton campaign manager Robby Mook said: "She believes every voice should be heard and no one should be intimidated, harassed or threatened in this process."