A trio of conservative groups are holding Sen. Roger Marshall’s, R-Kan., feet to the fire over his work on digital asset legislation with Democratic Sens. Elizabeth Warren, D-Mass., and Chris Van Hollen, D-Md.

“We are extremely disappointed in your effort to attack digital asset companies,” the Club for Growth, Americans for Tax Reform and FreedomWorks said. “Why are you supporting new, big government regulation?”

The conservative groups claim Marshall’s efforts “are likely to encourage digital asset companies to move outside of the U.S.’s jurisdiction.” The letter also pointed to the recent collapses of Silicon Valley Bank and Signature Bank, saying that Marshall, Warren and Van Hollen are trying to “prevent and slow alternative vehicles for investment” with their crypto policy moves.