Republican leaders in Congress have taken their first steps to begin repealing the Affordable Care Act. While U.S. Senator Joe Donnelly says now is a good time to make improvements, he says they don’t don’t have any sort of plan to replace it.

In a video statement recorded for his constituents, Donnelly said, “I have long said that the health care law is not perfect, and I have offered many ways we can improve it. I have been willing to work with anyone—Republican or Democrat—to improve the health care system in our country. But what I won’t do is support any effort that would create chaos in the insurance marketplace, increasing premiums and taking away insurance from over 20 million Americans.”

Sen. Donnelly’s full video statement is below: