The Environmental Protection Agency will indefinitely postpone bans on certain uses of three toxic chemicals found in consumer products, according to an update of the Trump administration’s regulatory plans.

Critics said the reversal demonstrated the agency’s increasing reluctance to use enforcement powers granted to it last year by Congress under the Toxic Substances Control Act.

E.P.A. Administrator Scott Pruitt is “blatantly ignoring Congress’s clear directive to the agency to better protect the health and safety of millions of Americans by more effectively regulating some of the most dangerous chemicals known to man,” said Senator Tom Carper, Democrat of Delaware and the ranking minority member on the Senate Environment and Public Works committee.

The E.P.A. declined to comment. In a news release earlier this month, the agency wrote that its “commonsense, balanced approach carefully protects both public health and the environment while curbing unnecessary regulatory burdens that stifle economic growth for communities across the country.”