Environmental Protection Agency Administrator Scott Pruitt faces mounting pressure to resign amid ballooning scandals over his spending habits and a sweetheart deal to rent a Capitol Hill condominium linked to a gas industry lobbyist.

A coalition of environmental groups last Wednesday launched a website called BootPruitt.com and offered a series of op-eds lambasting him as part of the first coordinated campaign to oust the administrator. On Thursday, Rep. Don Beyer (D-Va.) called for Pruitt to resign.

And on Sunday, former New Jersey Gov. Chris Christie (R), whose so-called Bridgegate scandal over politically motivated lane closures on the George Washington Bridge helped tank his presidential ambitions, became the first major Republican to call out the ethical concerns over Pruitts rental.

I dont know how you survive this one, and if he has to go, its because he never should have been there in the first place, Christie said on ABC News This Week.

Pruitt has come under scrutiny over his accommodations in Washington after ABC News reported last week that he rented a room in a luxury townhouse co-owned by the wife of a top gas industry lobbyist. That same day, Bloomberg News reported that Pruitt paid $50-a-night for the room, well below market value for a place in that neighborhood. The EPAs Office of General Counsel issued a hasty memo on Thursday arguing that the administrator paid a fair rate.

By Friday, ABC News reported that Pruitts adult daughter, a White House intern, stayed in another room at the property. Justina Fugh, the EPAs ethics lawyer, struggled to defend the arrangement when pressed by BuzzFeed News : I dont have any facts to know what the daughter did and didnt pay. I dont have any facts to know if shes a dependent on his taxes.

The ethical storm over Pruitts housing comes amid a groundswell of criticism over his spending.

Sen. Sheldon Whitehouse (D-R.I.) sent a letter to the EPAs inspector general last week highlighting the cost of Pruitts use of taxpayer-funded security details on trips home to Tulsa, Oklahoma, a family vacation to Disneyland in Anaheim, California, and an outing to the Rose Bowl college football game in Pasadena, California.