He said that since Sunday, the "coalition has not facilitated any humanitarian movements into or out of Yemen carrying relief items and aid workers."
UN, aid groups warn of 'starvation and death' in Yemen →
Pearson Cross, a political science professor at the University of Louisiana at Lafayette, says the scandal has created a sense of unease that could depress turnout for Vitter.
Scandal doesn't shake Vitter campaign in La. governor's race →