A Republican senator whose wife received a video of a beheading during Supreme Court Justice Brett Kavanaugh’s contentious confirmation process is calling for civility following top Democrats advocacy of a more aggressive approach to defeating their opponents.

In a series of tweets Wednesday, Colorado Sen. Cory Gardner referenced former Democratic presidential nominee Hillary Clinton's and former Attorney General Eric Holder’s comments without mentioning them by name.

At a campaign event in Georgia, Holder told Democrats that when Republicans “go low, we kick them.”

Video of Holder’s comments surfaced online a day after Clinton said, “You cannot be civil with a political party that wants to destroy what you stand for.”

“This is not who we are,” said Gardner. “We have our political disagreements and we should cherish the rights to express our disagreements. But when it comes to calls for violence and attempted murder and assassinations this country has gone too far and it’s time we step back from that brink.”

[Opinion: Trump on Hillary Clinton's rejection of civility: 'That's why she lost']