Transportation Secretary Elaine Chao is under fire from progressives and ethics watchdogs after reporting from Politico Tuesday revealed she helped deliver a $67 million federal contract to her husband Senate Majority Leader Mitch McConnell’s home state of Kentucky.

Kyle Herrig, president of the anti-corruption group Accountable.US, said the contract—the largest of its kind delivered to Kentucky during the three years President Donald Trump has been in office—is just the latest example of Chao’s behavior that warrants a serious look.

“The unending stream of stories that detail the depth of Secretary Elaine Chao’s improper use of taxpayer dollars to boost her husband Mitch McConnell’s political career is alarming,” Herrig said in a statement. “This type of political corruption is a threat to our democracy and destroys Americans’ faith in government.”

“Chao’s corruption has gone unchecked for too long,” Herrig added. “It’s time for House Oversight to expand its investigation to encompass her department’s unethical favoritism towards Kentucky in order to help her husband’s political career. Enough is enough.”

As The American Independent reports, Chao’s alleged favoritism toward her husband is under review by the Government Accountability Office.