Kavanaugh's nomination by US President Donald Trump to the lifetime role on the highest court in the US has unleashed a confrontational and fiery debate on his qualifications and character after university professor Christine Blasey Ford accused Kavanaugh of sexual assault when they were both in high school in the early 1980s.
WASHINGTON - US Supreme Court nominee Brett Kavanaugh said in Wall Street Journal op-ed on Thursday that he "might have been too emotional at times" in his Senate testimony last week in which he denied accusations of sexual misconduct.
The timing of the vote could be complicated by Republican Senator Steve Daines, whose office said on Thursday he planned to attend his daughter's wedding in Montana on Saturday, making him unavailable to cast his vote.
Republicans hold 51 of the 100 Senate seats.
"This investigation found no hint of misconduct", Mr Grassley said in a statement. Lisa Murkowski of Alaska, Susan Collins of ME or Jeff Flake of Arizona.
Late in the day, with Collins praising the reach of the brief FBI investigation and Flake indicating he had seen nothing incriminating in the results, the pro-Kavanaugh forces appeared closer to the prize.
Senators were poring over the document to determine whet-her it satisfies their concerns about Mr Kavanaugh.
Senator Joe Manchin, the only remaining undecided Democrat, said he would finish reading the report on Friday morning.
The FBI did not pursue any investigation into still other uncorroborated allegations lodged by others - including one by Julie Swetnick, who has given conflicting accounts but seems to suggest the judge was in the vicinity of high school parties where she says gang rapes happened.
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Women were far more likely than men in the poll to oppose Kavanaugh, 55 per cent to 40 per cent. In the short term he could provide the decisive fifth vote for a conservative majority on the nine-member court.
Trump, who Tuesday scornfully mocked Ford's Judiciary panel testimony, tweeted that Kavanaugh's "great life can not be ruined by mean" and "despicable Democrats and totally uncorroborated allegations!"
"At times, my testimony - both in my opening statement and in response to questions - reflected my overwhelming frustration at being wrongly accused, without corroboration, of awful conduct completely contrary to my record and character", the judge wrote.
That's three weeks longer than the average of the last three or four nominees to the Supreme Court.
Kavanaugh's demeanor and conduct during the hearing alarmed the law professors.
Other Republicans who'd already voiced support for Kavanaugh echoed Grassley, saying after a briefing that there'd been no corroboration of wrongdoing by Kavanaugh. Kavanaugh has said stories of bad behavior while drinking are exaggerated.
On Wednesday, the three Republican senators key to Kavanaugh's approval blasted Trump for mocking Blasey Ford's memory lapses at a political rally.
No electronic devices are allowed inside and the report is only available as a hard copy, no emails or PDF's.
"We had many fears that this was a very limited process that would constrain the Federal Bureau of Investigation from getting all the facts", Senate Minority Leader Chuck Schumer said Thursday morning. If so, that could be enough for a Trump victory in this battle.
Police later threatened to clear a public hallway outside her office in the Dirksen Senate Office Building and physically blocked reporters from approaching Collins as she left the office to return to the Capitol for a vote.
"I feel his performance in the hearings ultimately changed my mind", Stevens said, noting that he believes "there's merit to that criticism" about Kavanaugh's temperament disqualifying him from the court, and that "senators should really pay attention to that". Republican leaders sounded unmoved.