Seven months after taking the helm of the embattled Department of Veterans Affairs, Robert McDonald insisted during his first Sunday show interview that he has already brought new accountability measures to a scandalized department.

“We’re making fundamental changes in the department… 900 hundred people have been fired since I became secretary,” McDonald told Meet the Press’s Chuck Todd on Sunday morning. “We’ve got 60 people who we’ve fired who have manipulated wait times, we’ve got about 100 senior leaders who are under investigation now… so we’re holding people accountable.”

The appearance came just a week after McDonald got into a heated exchange with Rep. Mike Coffman (R-Colo.), who during a Congressional hearing implied that McDonald was glossing over the systemic issues within the department.

Veterans Affairs Secretary Robert McDonald and Rep. Mike Coffman (R-Colo.) engaged in a heated exchange during a hearing on the agency’s budget. (C-SPAN)

But, despite some criticism, McDonald has insisted that his leadership has already begun to make a difference.

“Wait times are down 18 percent nationally… we’re making progress,” McDonald said on Meet the Press. “We’re not where we need to be yet, I’m not saying that. What I’m saying is we’re making progress, we’re moving in the right direction.”

McDonald, the former CEO of Procter and Gamble, took over the VA this summer as the nation was outraged to find out that VA hospitals had systematically understated wait times for medical care for veterans, and that some veterans had died while waiting for medical service.

The scandal led to the resignation of former VA Secretary Eric Shinseki, and prompted McDonald’s appointment with a mandate for reform.

“I’m determined to take business practices and apply them to government and make them work,” McDonald said. “And I think so far, with what we’ve done, with the improvements we’ve made, and the changes we’ve seen, it works.”