The fight over ObamaCare’s Medicaid expansion escalated Monday, as Texas’s Republican governor backed a lawsuit from Florida fighting the expansion effort.

Last week, Florida’s Republican Gov. Rick Scott announced he would sue the Obama administration over what he calls an effort to force the state to expand Medicaid under ObamaCare.

Texas’s Republican Gov. Greg Abbott on Monday announced his support for the lawsuit.

“When the federal government exceeds its constitutional authority, the States must take action,” Abbott said in a statement. “[I] commend Governor Rick Scott’s decision to take legal action to protect these important constitutional principles.”

At issue is the Obama administration move to link Florida’s rejection of a Medicaid expansion to separate federal funding that helps hospitals in the state care for the uninsured.