Three U.S. senators have called for an overhaul of federal agents’ use of tear gas and pepper spray, citing a ProPublica investigation that found at least 79 children were left screaming, coughing or hurt by these chemicals during President Donald Trump’s immigration crackdown.

Lawmakers said the findings showed more restrictions are needed to avoid injuring bystanders — including children — with chemical munitions. Such weapons were designed to combat rioters and soldiers, and their compounds are toxic, especially to children, who breathe more rapidly than adults relative to their body weight.

“This reporting makes clear that we need federal legislation to rein in the over-use and misuse of tear gas and chemical agents,” Sen. Cory Booker, a Democrat from New Jersey, said in a statement. “We cannot allow another child to be tear-gassed by federal law enforcement officers.”

ProPublica found that the Department of Homeland Security’s policies on the use of these weapons are less restrictive than those of some local police departments, many of which have been forced to adopt stronger ones following lawsuits or local legislation. There is no uniform standard governing how and when law enforcement departments can use these weapons.