There's no sign of an end to the debate over motions to suspend three former Conservative senators without pay.
The upper chamber is scheduled to sit tomorrow, even though the Senate isn't normally in session on Fridays.
And the debate over the fate of Mike Duffy, Pamela Wallin and Patrick Brazeau is opening rifts within Conservative ranks.
A former president of the federal Conservative party is defying the Harper government.
Senator Don Plett says he can't bring himself to support motions that he says violate the fundamental right to due process for the three Senators.
Thursday's debate saw Marjory LeBreton, former government leader in the Senate, fire back at Duffy for alleging she was part of a "monstrous'' conspiracy to intimidate him into accepting a secret deal to pay back ineligible expenses or face being disqualified from sitting in the Senate.
She variously described Duffy's claims as "utterly preposterous,'' "blatant falsehood'', "a whopper'' and "stretching credulity.''
And, although LeBreton didn't directly question Prime Minister Stephen Harper's judgment in appointing Duffy to the upper chamber, she revealed that she was never a fan of the former broadcast journalist, who hosted a daily show on federal politics until his elevation to the Senate in 2009.
"I sometimes found myself ... frustrated by his style of journalism, trading as he did, more often than not, on gossip and the latest hot rumour,'' LeBreton told the upper chamber.
"And sometimes I was so disgusted that I felt like putting my foot through the television set.''
When anyone complained, Duffy would say, "It's showbiz,'' LeBreton said, implying that Duffy has taken the same approach to justifying his role in the Senate expenses scandal.
Duffy and Brazeau, along with former Liberal senator Mac Harb, are under investigation by the RCMP for allegedly fraudulently claiming Senate housing allowances and living expenses.
The Mounties are also investigating the fact that Duffy accepted $90,000 from Harper's former chief of staff, Nigel Wright, to reimburse his ineligible expenses.
That $90,000 cheque was again a focal point down the hall during the daily question period in the House of Commons, where the prime minister's combative bluster from the day before was gone, replaced by a bob-and-weave defence.
Where Harper insisted in June that nobody but Wright and Duffy knew of the reimbursement scheme, he changed his tune Thursday, saying Wright "informed very few people'', all of them known to be key Harper confidantes.
"Mr. Speaker, I refer the prime minister to Hansard of June 5,'' retorted NDP Leader Tom Mulcair.
"There was no 'very few' in there. It was 'nobody.''
A Senate committee has also asked the RCMP to investigate Wallin's allegedly improper travel expenses.
All three maintain they did nothing wrong and have denounced the proposed suspensions as a violation of their fundamental right to due process and the presumption of innocence.
None has yet been charged, much less convicted of any wrongdoing.
They also claim they're being railroaded by a government desperate to put an end to the scandal, which has engulfed it for almost a year.
The debate was expected to continue until midnight and was scheduled to resume Friday morning, a day the Senate does not ordinarily sit.