Pakatan Rakyat will move a motion in Parliament to censure Inspector-General of Police Khalid Abu Bakar for arresting an MP over a speech made in the House.

PKR’s Lembah Pantai MP Nurul Izzah Anwar ( left ) was arrested yesterday for alleged sedition over her father and jailed Opposition Leader Anwar Ibrahim’s speech which she read out in the House last week.

"It is hoped to inculcate an understanding in Malaysia’s top cop on the concept of separation of powers in this country," Nurul Izzah said in a statement today.

Pakatan will table the motion under Section 7 of the Houses of Parliament/ Act 347 (Privileges and Powers) Act 1952, she said.

Section 7 of the Act states that no member of Parliament is liable for civil or criminal proceedings over what he or she says before the House.

Nurul Izzah had read her father’s speech, which criticised the judges who convicted him of sodomy on Feb 10, while debating the royal address.

She is also being investigated for the March 7 Kita Lawan rally in Kuala Lumpur held in solidarity with Anwar.

Pakatan will also move to censure the IGP for this, she said, because it was contempt of court.

"We must reaffirm our federal constitution and separation of powers principle by sanctioning the police for contempt of court in both going against the court’s decision in the ongoing investigations under Peaceful Assembly Act Section 9 (5) as well as Section 7 of Act 347."

Released from custody today, she also thanked those who showed their support.

Police, meanwhile, say they now want to question her sister Nurul Nuha over the Kita Lawan rally.

Nurul Nuha fronts the March 2 Freedom movement which the family launched to lobby for Anwar's release.

Nurul Izzah’s arrest made international news, with condemnation also coming from within BN.

She was arrested after former Kulim Bandar Baharu MP Zulkifli Noordin lodged a report citing her for sedition over a portion of the speech which accused the judges of 'selling their souls to the devil'.