Mr Hashemi said only members of Iraq's security apparatus were capable of co-ordinating such large-scale attacks.
BBC: Baghdad blasts: Hashemi accuses government over attacks
Mr Hashemi said the US should bear responsibility for the way Iraq was now being governed.
BBC: Baghdad blasts: Hashemi accuses government over attacks
Mr Hashemi is currently in Irbil in Iraqi Kurdistan, under the protection of the regional government.
But a statement from Mr Hashemi's office condemned the amendment as "unfair and unconstitutional".
So does former president Hashemi Rafsanjani, regarded as sympathetic to some of the opposition's grievances.
Turkish Prime Minister Recep Tayyip Erdogan said Mr Hashemi was currently in Turkey for medical treatment.
Mr Hashemi has been accused of orchestrating terror attacks on officials and security forces, a charge he denies.
BBC: Baghdad blasts: Hashemi accuses government over attacks
International police organisation Interpol has issued a worldwide alert for the arrest of fugitive Iraqi Vice-President Tariq al-Hashemi.
This propelled Mr Ahmadinejad, then a political novice, into a surprise second-round triumph against Hashemi Rafsanjani, a former president.
Hashemi argues that Hashim, a 65-year-old career military officer, had little choice but to follow orders from his brutal boss.
Ahmadinejad foe Akbar Hashemi Rafsanjani, a former president, appears unlikely to make one last presidential run, despite speculation to the contrary.
Mr. SADJADPOUR: You know, during the Hashemi era, during the previous president, Mohammad Hashemi, Haleh was traveling to Iran very frequently.
"Mr al-Hashemi is in our country due to his health problems and to hold talks regarding latest developments, " Mr Erdogan said.
Vice President Tareq al-Hashemi can remain in Turkey as long as he needs to, Prime Minister Tayyip Erdogan said on Tuesday.
MSN: Iraq stops registering Turkish firms amid row over Hashemi
Another prominent figure Hassan Rowhani, Iran's former nuclear negotiator and confidant to ex-President Ali Akbar Hashemi Rafsanjani, also put forward his name.
But other big names are in the mix, including Ahmadinejad's top aide Esfandiar Rahim Mashaei and former Iranian President Akbar Hashemi Rafsanjani.
Vice President Hashemi said carrying out the death sentence against Hashim could further undermine the already stalled reconciliation efforts in post-Saddam Iraq.
Mr Hashemi is currently believed to be staying in Istanbul, having also passed through Qatar and Saudi Arabia after leaving northern Iraq.
The Iraqi government issued the warrant for Mr Hashemi's arrest on 19 December, the day after the last US troops left the country.
BBC: Iraqi bloc ends parliament boycott over Hashemi warrant
Judiciary Chief Ayatollah Hashemi Shahroudi has ordered the head of Tehran's Justice Department to make sure the appeals process is quick and fair.
On Monday Baghdad called for Mr Hashemi to be extradited, but Qatar refused, saying there was no court judgement to justify such a move.
The fugitive Iraqi Vice-President, Tariq al-Hashemi, has left Qatar after a four-day visit which sparked a row with the rest of the Iraqi government.
For his part, Mr Hashemi has accused the Iraqi government of being behind the bombings, in which nearly 70 people in Baghdad were killed.
BBC: Iraqi bloc ends parliament boycott over Hashemi warrant
Mr Hashemi is the most senior Sunni politician in the government, but fled to the autonomous Kurdish region after being accused of terrorism last year.
An Iraqi court sentenced Hashemi to death by hanging on Sunday after being convicted of running death squads, a charge he says was politically motivated.
MSN: Iraq stops registering Turkish firms amid row over Hashemi
Mr Hashemi is currently in Irbil in Iraqi Kurdistan, under the protection of the regional government, but Mr Maliki has demanded that they give him up.
Mr. Hashemi, who denies the accusations, fled to the north of Iraq, where he is being protected by the leadership of the Kurds who control the area.
Mr Hashemi had told the Pan-Arab newspaper al-Sharq al-Awsat during his stay in Qatar that he would go next to Saudi Arabia on his tour of "friendly states".
Ironically, the man most adept at manipulating this hidden power structure is one of Iran's best-known characters--Ali Akbar Hashemi Rafsanjani, who has been named an ayatollah, or religious leader.
Former President Ali Akbar Hashemi Rafsanjani, chairman of Iran's Assembly of Experts and a supporter of opposition leader Mir Hussein Moussavi, was quoted Saturday by the semi-official Iranian Labor News Agency.
CNN: Rafsanjani doubts Iranians 'satisfied' with election aftermath
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