The Trump administration is finalizing a proposal to require opioid testing for certain transportation workers.

The rule would affect railroad engineers, pilots, air traffic controllers, truck drivers and other employees who are subject to federal drug and alcohol testing regulations.

Transportation Secretary Elaine Chao Elaine Lan ChaoChick-fil-A drops fight for San Antonio airport location Overnight Defense: US marks 19th anniversary of 9/11 attacks | Trump awards Medal of Honor to Army Ranger for hostage rescue mission | Bahrain, Israel normalizing diplomatic ties Trump marks 9/11 with moment of silence on Air Force One, remarks in PA MORE said in a letter to Rep. Peter DeFazio Peter Anthony DeFazioHouse report rips Boeing, FAA over mistakes before 737 Max crashes Pelosi: House will stay in session until agreement is reached on coronavirus relief Trump Jr. seeks to elect 'new blood' to Republican Party MORE (D-Ore.) this week that the proposed rule is “undergoing final review.” The agency has also ordered a study on substance abuse in the transportation sector, she added.

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“Safety is the Department of Transportation’s top priority, and we are committed to working with Congress and other federal departments to combat opioid abuse,” Chao wrote.

The letter comes in response to complaints from House Democrats, who raised concerns earlier this week that the administration had stalled the rulemaking process.

Currently, the Department of Transportation only administers a five-panel drug test, which includes marijuana, cocaine and PCP, for safety-sensitive transportation workers.

But the the agency's decades-old drug testing does not include prescription painkillers and opioid misuse, which has skyrocketed in the country in recent years.

“We are in the midst of a prescription opioid crisis in America,” Democrats on the House Transportation and Infrastructure Committee wrote in a letter to Chao on Tuesday. “In 2016 alone, it is estimated that 11.8 million Americans engaged in opioid misuse.”

“Transportation workers are not immune to this crisis,” the lawmakers said.

Two maintenance workers who were struck and killed by an Amtrak train last year while working on the track tested positive for cocaine and oxycodone.

To combat the growing opioid crisis, the Department of Health and Human Services updated its mandatory guidelines in January for Federal Workplace Drug Testing Programs and allowed the Transportation Department to add four prescription opioids to its drug-test panel: hydrocodone, hydromorphone, oxymorphone and oxycodone.

The Transportation Department then issued a notice of proposed rulemaking signaling that it would adopt the Health and Human Services guidelines on opioids. Comments on the proposal were due six months ago.