Incumbent Republican Sen. Ron Johnson is standing by Donald Trump, echoing attacks the presidential nominee is making against his opponent Hillary Clinton.

Johnson on Monday was asked in an interview on WLIP-AM in Kenosha to respond to comments from the campaign of his opponent Russ Feingold about how Johnson could continue to support Trump. Many Republican office holders have dropped their support and called for Trump to exit the race after vulgar comments he made about women in 2005 surfaced Friday.

Johnson said he would ask Feingold how he could continue to support Clinton, saying that her "dereliction of duty" cost four American lives in Benghazi and her use of a private email server put national security at risk.

Trump made similar attacks in Sunday's presidential debate.