(Reuters) - The political movement loyal to anti-American cleric Moqtada al- Sadr quit Iraq's ruling Shi'ite Alliance on Saturday, leaving Prime Minister Nuri al- Maliki's coalition in a precarious position in parliament.
The move further weakens the ruling coalition, which even before the defection had failed to push through laws aimed at reconciling Iraq's warring majority Shi'ite and minority Sunni Arabs.
Maliki's government now enjoys the support of only about half of Iraq's 275 lawmakers, although it could survive with the support of a handful of independent lawmakers.
"The political committee has declared the withdrawal of the Sadr bloc from the ( Shi'ite ) alliance because there was no visible indication that the demands of Sadr's bloc were being met," the Sadr movement said in a statement released at a news conference in the holy Shi'ite city of Najaf .
An adviser to Maliki said the government had no immediate comment.
The decision by Sadr's movement to quit the Shi'ite Alliance in parliament was not unexpected after the cleric pulled his six ministers from the cabinet in April.
Maliki can still count on the backing of two other Shi'ite Islamist parties and the two main Kurdish parties in parliament, and so far no party has launched any push for a no-confidence vote in his government.