On Thursday, armed Islamists attacked the country's Garissa college, leaving 147 people killed and more than 100 wounded.
"We'll not (stand for) continuing losing our children in cold blood because the government has failed to protect them," Wamalwa was quoted as saying by USA Today.
According to the media outlet, the lawmaker said Kenya's anti-terrorist police had failed to prevent the tragedy and called for disbanding the unit and forming another body to fight terrorism.
The responsibility for the Thursday attack was claimed by the Somalia-based al-Shabaab group, which has pledged allegiance to al-Qaeda.
On Friday, Kenyan Interior Minister Joseph Ole Nkaissery said five suspects with alleged links to the attack had been detained.
On Saturday, Kenyan President Uhuru Kenyatta announced a three-day national mourning during his address to the nation.
