The leader of parliament's largest Sunni Arab bloc complained Sunday that Sunni members of the Shiite-led government were marginalized and given no real authority, charging that an 11-week-old US-backed security push in Baghdad was victimizing the city's Sunni residents. A visibly angry Adnan al-Dulaimi, leader of the Iraqi Accordance Front, said he had nothing to fear from calls by Shiite lawmakers for lifting his parliamentary immunity to face questioning on alleged involvement in sectarian cleansing in Baghdad and inciting sectarian strife. "I fear nothing and I will confront those who made these false charges," he told a news conference. Al-Dulaimi, who is thought to be nearly 80, is one of the most outspoken critics of Shiite Prime Minister Nouri al-Maliki's government. He recently has returned from neighboring Jordan where he underwent surgery for an unspecified ailment, according to his ally and fellow Sunni lawmaker Salim Abdullah.