Kavanaugh testified Thursday to the Senate Judiciary Committee over an allegation of sexual assault when he was in high school.
The Senate Judiciary Committee will vote on Kavanaugh's confirmation on Friday, potentially advancing him to a wider Senate vote and eventual confirmation to the Supreme Court.
"I have deep reservations about Judge Kavanaugh's nomination to this lifetime position and, as I stated, we have been unable to get all the information necessary regarding this nomination", Donnelly said.
Other candidates for the high court are available, the editors said, concluding, "in a world that is finally learning to take reports of harassment, assault and abuse seriously, it is time to find a nominee whose confirmation will not repudiate that lesson". He has denied all the accusations.
It was clear Republicans were still short of votes for final Senate approval after Thursday's hearing.
The letter was released hours before members of the Judiciary Committee were set to vote on Kavanaugh's nomination.
Graham said Democrats' behavior in the hearing showed "they never meant to protect Dr. Ford".
Hours later, Kavanaugh entered the hearing room fuming. Shortly after, he was confronted in an elevator by two women who, through tears, said they were sexual assault victims and implored him to change his mind.
The Judiciary committee plans a vote on Kavanaugh Friday. "Throughout this process, I've been interviewed by the Federal Bureau of Investigation, I've done a number of "background" calls directly with the Senate, and yesterday, I answered questions under oath about every topic the Senators and their counsel asked me".
"I mean, she doesn't always vote the way I want her to, but she votes the way Maine wants her to, which is what her job is", he said.
"I guess I'm hoping that she can hear that her voting yes not only is going to have an effect on individuals, but I'm hoping she hears that it's going to have an effect on her politically", Whitman said. He later apologised to her.
Sen. Lindsey Graham, R-S.C., also let loose on his Democratic colleagues during the proceedings, which he called a "sham" hearing to probe sexual assault allegations against Kavanaugh, in a display that earned him praise from the White House and scorn from the left.
Republicans hold a narrow 51-49 majority in the Senate, and can only afford one defection in their bid to confirm Kavanaugh, assuming they secure no Democratic votes. Democrats are likely to grill Kavanaugh on all of their allegations and the corroborations from some of their friends and classmates, as well as his drinking habits in high school and college.
"I believe you", he said.
"I did not ask to be involved in this matter nor did anyone ask me to be involved", the letter said, and referred to his previous letter sent on September 18.
"This whole two-week effort has been a calculated and orchestrated political hit fueled with apparent pent-up anger about President Trump and the 2016 election", he said.
During Mr Kavanaugh's 45-minute opening statement, senators watched intently, the only sound the clicking of cameras. In the front row, family and friends quietly cried including his wife, Ashley, whose lips were trembling.
The motorcade transporting President Donald Trump drives down Pennsylvania Avenue heading towards the Trump Hotel in Washington on Thursday, Aug. 27, 2018.
Of his viral moment in the Kavanaugh hearing today, where he blasted Democrats as obstructionists trying to ruin the judge's life, the South Carolina Republican said, "I just told the truth". He said this process had become a national disgrace, with Democrats replacing advise and consent with search and destroy. Ultimately, the decision whether or not to delay a floor vote for Kavanaugh rests in the hands of Senate Majority Leader Mitch McConnell, R-Ky.
The California psychology professor spoke carefully and deliberately during the hearing, using scientific terminology at one point to describe how a brain might remember details of events decades later.