NHTSA Deputy Administrator Heidi King is expected to leave the agency as early as next week.

The top-ranking executive at the National Highway Traffic Safety Administration is expected to step down from the job as early as next week, according to multiple reports.

Deputy Administrator Heidi King plans to leave the government agency for an undisclosed reason. Nominated, but not confirmed, by President Donald Trump for NHTSA’s top post, she is apparently not being forced out of the job.

The Department of Transportation has not offered any comment on the report. King hasn’t commented on the possibility, although she joked in a social media posting: “How do you know when you are working too hard? When your vacation is reported as a career change!”

(NHTSA Analyzing 12.3M Non-Takata Airbags Due to Possible Defect)

King, who has been with the agency since 2016, took the lead on Trump’s push to rewrite fuel efficiency and emissions rules through 2026. On Friday, NHTSA and the EPA submitted the first part of the final regulation to the White House Office of Management and Budget for review.

She subscribed to the idea that lowering the mandate would be good for automakers and, ultimately, good for consumers. King said that the tougher standards helped to drive up the cost of new vehicles. With lower prices for new vehicles achievable, owners of older vehicles would be more likely to trade in less efficient models for newer, more efficient vehicles.

The Trump administration said this summer it was issuing final rules to suspend the 2016 Obama administration regulation that more than doubled penalties for automakers failing to meet fuel efficiency requirements.

King took over leadership of NHTSA after former NHTSA chief Mark Rosekind joined Zoox as its Chief Safety Innovation Officer.

The final rule is expected to bar California – a move she favored despite being from California – from setting its own vehicle emissions rules.

(Former NHTSA Chief Rosekind Joins Autonomous Car Start Up)

She took over the day-to-day leadership of the agency when former Administrator Mark Rosekind resigned when the Trump administration took over. Prior to joining NHTSA, she held a variety of jobs at different government agencies.

King previously served as the chief economist for the House Energy and Commerce Committee and as a regulatory policy analyst at the White House Office of Management and Budget. She also worked in the private sector for Telcordia Technologies, Pfizer Inc. and, most recently, General Electric Co., where she was global director of environmental health and safety risk from 2013 to 2016.

After earning a bachelor’s degree at the University of California, Irvine, she got a master’s in economics from the California Institute of Technology. She also worked as a California park ranger. Oddly, she is the only member of the Trump administration who helped to push the lower fuel efficiency standard to depart.

Bill Wehrum, who served as EPA air chief, abruptly announced his resignation in late June He had overseen EPA’s portion of the rollback, which involves weakening greenhouse gas emissions rules for cars and revoking California’s authority to set tougher tailpipe pollution limits than the federal government.

(Trump Administration Rejects Carmakers Pleas on Emissions)

Jeffrey Rosen, deputy secretary at the Department of Transportation, left earlier this year to serve as the No. 2 official at the Justice Departmentj, where he and King were set up DOT’s portion of the rollback, according to Greenwire.com.

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