Opposition Leader Thomas Mulcair slammed Prime Minister Stephen Harper鈥檚 decision to prorogue Parliament, saying the Conservative government is only trying to avoid tough questions about the Senate spending scandal and other controversies.

鈥淪tephen Harper for the fourth time has prorogued Parliament of Canada, depriving elected officials of their ability to do what they were put there to do, which is to ask questions of the Canadian government,鈥 Mulcair told reporters Tuesday.

鈥淢r. Harper is afraid to answer the questions we have for him.鈥

Although prorogation is the government鈥檚 prerogative, Harper is using it to go 鈥渋nto hiding,鈥 Mulcair said.

鈥淭hat鈥檚 not a way to be the head of a state. And that鈥檚 certainly not a way to behave in a democracy.鈥

Mulcair said the New Democrats are calling on Harper to 鈥渟tart showing some leadership, to show up in Parliament and start giving clear answers on the Senate scandal and a lot of other issues that are plaguing his government.鈥

CTV's chief political correspondent Craig Oliver notes prorogation is actually a routine procedure for a majority government to use halfway through its mandate, since it gives them an opportunity to "pull the plug on Parliament" and refocus its priorities with a new throne speech.

But Oliver told Canada AM that Harper "did kind of give prorogation a bad name because he used it twice, in 鈥08 and 鈥09, when the only purpose was to save his government from defeat and that鈥檚 not what that parliamentary procedure is designed for.鈥

It was back in December 2008 when Harper first enraged constitutional experts by proroguing Parliament. Many accused him of simply trying to avoid a confidence vote over a fiscal update, which his minority government appeared certain to lose.

The prime minister prorogued Parliament again the following year in what many said was a bid to end Commons鈥 committee hearings into the treatment of Afghan detainees.

Political analyst Scott Reid agrees that Harper has a 鈥渟potted history鈥 when it comes to prorogation, but he says that this time, the procedure is being used in the way it was intended.

鈥淭his is why prime ministers use prorogation: to give the government an opportunity to wipe the slate clean, restart and refocus,鈥 he said.

Still, that didn鈥檛 stop the opposition from saying Harper turned to prorogation in order to dodge accountability over the ongoing Senate expenses scandal, which has led to RCMP investigations into Senators Mike Duffy, Patrick Brazeau, Mac Harb and Pamela Wallin.

But Reid believes the prorogation decision was about more than avoiding debate.

鈥淭his government looks desperately like it鈥檚 out of gas: it isn鈥檛 just the Senate scandal that鈥檚 been swirling around this government; overall, this government has a sort of mid-term malaise,鈥 he said.

Reid says the Senate scandal has made it hard for Harper to 鈥渙wn the news鈥 and set the agenda.

The decision to delay the start of the fall session of Parliament gives his Conservative government a few more weeks to draft a throne speech, Reid says, and will give Harper a chance to remind voters what his party鈥檚 priorities are before the next election.

鈥淗e鈥檚 looking toward 2015. And the election begins in October, when the speech from the throne comes down and offers a new focus, a new set of priorities.鈥

Federal MPs will now reconvene sometime in October, instead of on Sept. 16, as originally planned. The precise timing has not been decided, but some Parliament Hill watchers said it will likely be after Thanksgiving.

Oliver says the end result is that the next parliamentary session will not be a long one: Due to the long summer break, which started in June, and the news of prorogation, Parliament is likely to only sit for seven weeks or so before needing to rise for Christmas holidays.

鈥淭hat means Harper can avoid having to answer to the House of Commons and the opposition leaders for most of that seven-month period. I think it looks at least like this is part of what鈥檚 going on here,鈥 Oliver said.

But Reid doesn鈥檛 believe the Senate scandal is over just yet.

鈥淭hese scandals are not going to go anywhere,鈥 he said. 鈥淭here will be a new auditor general鈥檚 report. I鈥檓 sure it鈥檚 going to dig up a ton of skeletons in the parliamentary garden. All that stuff is still going to come out.鈥

With files from Angela Mulholland