What was Mike Duffy allowed to claim from the Senate? Day 2 of his trial begins 

WATCH ABOVE: A retired Senate clerk took the stand on the second day of the Mike Duffy trial. But as Mike Le Couteur reports, his testimony so far seems to have helped the defence.

OTTAWA – Exactly which expenses Mike Duffy was allowed to claim from the Senate during his five years in the upper chamber will take centre stage on the second day of his fraud and breach of trust trial – and documents released by the court on Day 1 suggest he took advantage right away.

Current and former Senate officials are expected to take the stand on Wednesday as the first Crown witnesses to explain some of the upper chamber’s rules for residency and expenses.

It’s the issue at hand as Duffy faces 31 fraud and breach of trust charges, along with a bribery charge for accepting $90,000 to pay off his expenses from former chief of staff Nigel Wright.

WATCH: How did Mike Duffy react on the first day of his fraud trial?

READ MORE: ‘A fraud, a fiction and a lie’ – Mike Duffy’s lawyer labels Nigel Wright ringleader in PMO conspiracy

On the first day of trial, documents released by the Crown show Duffy claimed an $81.55 per diem on Dec. 23, 2008 – the day after his appointment to the Senate, and more than a week before his official swearing-in on Jan. 2, 2009.

Duffy’s defence argued on opening day the suspended senator, who was appointed by Prime Minister Stephen Harper to represent Prince Edward Island, was entitled to claim living expenses even though he already owned his Kanata, Ont. home.

See Duffy trial exhibits below:

Defence lawyer Donald Bayne argued there are no rules or requirements for how many days a senator must spend at his primary residence – in Duffy’s case, PEI – or secondary residence in order to claim living allowances.

But Crown prosecutor Mark Holmes says Duffy claimed expenses he shouldn’t have, including family and shopping trips from British Columbia to Peterborough, Ont., which had nothing to do with his work as a senator.

READ MORE: Mike Duffy billed taxpayers for vacations, a personal trainer and trip to adopt a puppy, Crown alleges

Holmes said Duffy billed the Senate for a $3,000 flight so he could give a speech in which he was paid $11,000, and flew to funerals on the public dime.

Watch: Mike Duffy pleads not guilty in Senate expense scandal trial

– With files from the Canadian Press