President Trump has no equal when it comes to political mudslinging, according to a Democratic senator.

"Look, nobody goes lower than Donald Trump. I mean that's a bottomless pit. No one's competing with that," Sen. Chris Van Hollen, D-Md., said Sunday during an interview with CBS News' "Face the Nation." "He gets up at his rallies, he says 'go beat the crap out of them,' he says 'lock ‘em up.' I actually don't think voters, especially independent voters, like that."

Van Hollen's comments come after 2016 Democratic presidential nominee Hillary Clinton and former Obama-era Attorney General Eric Holder were recorded using pugnacious rhetoric ahead of the 2018 midterm elections, which critics have condemned for eschewing civility in politics.

Clinton, for example, told CNN it was impossible to remain circumspect when your political opponent -- in this case, the Republican Party -- “wants to destroy what you stand for.” It was also reported last week that Holder modified former first lady Michelle Obama's 2016 campaign motto and told attendees at an event in Georgia to "kick" Republicans "when they go low."

"What I think Hillary Clinton was saying is that Democrats are in a pitched battle on very important issues in our country, and we need to fight hard," Van Hollen said Sunday.

"I mean, this is political trench warfare and we're going to engage in that battle," he added later in the interview. "And that's why Democrats in the Senate are doing a lot better than people expected us to do more than a year ago when Republicans said they were going to win a net of eight seats."