The EPA's Office of Inspector General is launching an audit of Administrator Scott Pruitt's frequent travel to his home state of Oklahoma this year to assess whether he has violated agency policies. The announcement followed a request by members of Congress and an independent investigation that showed Pruitt had spent nearly half his time this spring traveling home, largely at the taxpayers' expense.

In July, the Environmental Integrity Project, a watchdog group founded by former EPA employees, released a report detailing Pruitt's frequent trips to Oklahoma.

It found he had spent 48 days traveling during a 92-day period in March, April and May, with 43 of those days either in or on the way to and from Oklahoma. His calendar, which the group obtained with a Freedom of Information Act request, said Pruitt met with several industry and conservative groups, including the Oklahoma Well Strippers Association and the Heritage Foundation.

Eric Schaeffer, the watchdog group's executive director and a former director of civil enforcement at the EPA, said at the time that the report showed Pruitt is "more focused on cultivating his relationships with industry and conservative political organizations in his home state of Oklahoma than he is on protecting the environment and the public health for the rest of America."

The audit, announced Monday, comes in response to requests by several Democrats in the House and Senate, including Rep. Frank Pallone, Jr. of New Jersey, ranking member of the Energy and Commerce Committee, and Sen. Tom Carper of Delaware, ranking member of the Environment and Public Works Committee.

A letter announcing the audit says it will examine how frequently Pruitt has traveled and at what cost, as well as whether he and his staff and security detail followed EPA travel procedures. It also will examine whether those procedures "are sufficiently designed to prevent fraud, waste and abuse with the administrator's travel that included trips to Oklahoma."

Pruitt's calendar noted several interviews and meetings with unspecified people in the state. It also showed that Pruitt often listed just one or two events for trips that lasted three days. The report said airfare for Pruitt alone—not his security detail—totaled more than $12,000 in taxpayer funding. Pruitt paid for some of the travel, including a flight to Tulsa from Houston, where he met with an economic consulting group.

In an email, Amy Graham, an EPA spokesperson, rejected speculation that the travel was political. "Administrator Pruitt is traveling the country to hear directly from the people impacted by EPA's regulations outside of the Washington bubble," she said. "This is nothing more than a distraction from the administrator's significant environmental accomplishments."

The Environmental Integrity Project welcomed today's announcement. "We are glad that the EPA Office of Inspector General is looking into this issue, to determine whether taxpayer funds were spent appropriately," Sylvia Lam, an attorney with the group, said in a statement.

The audit is being conducted by the inspector general's forensic audits office, which, according to its annual plan, "is responsible for conducting financial audits of EPA assistance agreements and contracts to identify potentially fraudulent actions," as well as determining "acceptability of costs claimed under specific financial instruments." The letter announcing the audit says work will begin this week.