"Donald Trump's campaign is spiraling", Mook said on a conference call with reporters. It's unclear whether he understands the potential damage of his words, or simply doesn't care. "The peaceful transfer of power is a hallmark of American history".
Trump's supporters appear to share his concerns.
The responsibilities for the NY billionaire in such a scenario are minimal.
"The media is piling on with unsubstantiated claims ... while they ignore an avalanche of hard evidence about corruption, pay to play, political favoritism emanating out of Hillary Clinton's years as secretary of state", Pence told "Fox News Sunday". "Media rigging election!" Trump wrote. He's accused Clinton of meeting with global financial powers to "plot the destruction of US sovereignty" and argued his opponent shouldn't have even been allowed to seek the White House.
And given the latest survey results, that's actually some of the more encouraging data for the Republican nominee.
The Fairleigh Dickinson University PublicMind poll, conducted before allegations of sexual misconduct against the candidate emerged but after he was recorded making lewd comments about women in a 2005 video surfaced, found almost half, 49 percent of voters found the remarks "unrelated to his ability to serve".
"'Poll watchers' are allowed to go to the precincts and sit there and see how many people are coming in to vote and see if there are any irregularities at the polls", she said.
The Indiana governor also distanced himself from Trump on a pair of other issues.
During a campaign event Tuesday with Trump's running mate, Mike Pence, a voter said she was deeply concerned about voter fraud and pledged to be "ready for a revolution" if Clinton wins.
"We will absolutely accept the results of the election", Pence said in television interviews.
An August study by The Washington Post found 31 credible cases of impersonation fraud out of more than 1 billion votes cast in elections from 2000 to 2014. But Trump seemed to brush back against his vice presidential pick.
With the election just three weeks away, one thing is certain- voters are engaged an ready to exercise their vote. He told the New York Times on Monday that Trump's allegations are "wrong and engaging in irresponsible rhetoric".
But these are also delicate times for Clinton. Few other details were immediately available.
"We're witnessing a criminal enterprise" at work, he said of the Clinton campaign.
But that task wouldn't be Clinton's alone.
Not all Trump supporters are racists, sexists, bigots - some are just hurting, Clinton said.
The nation's top elected Republican, House Speaker Paul Ryan, who has declared that he would no longer "defend" the party's nominee, rebuked Trump over his comments questioning the validity of the election process.
There have been efforts in recent years, largely in Republican-led states, to pass laws requiring voters to show photo identification at the polls. "Participation in the system - and particularly voting - should be encouraged, not dismissed or undermined because a candidate is afraid he's going to lose".