JPMorgan Chase (JPM) CEO Jamie Dimon had some choice words for Coinbase (COIN) CEO Brian Armstrong after months of their firms clashing over a major crypto bill.

A rule on offering interest on dollar-pegged stablecoins, tucked into the Clarity Act, has been a thorn in the banking industry’s side. During a wide-ranging interview on “Fox Business Network’s Mornings with Maria,” Dimon accused Armstrong and Coinbase of using that rule as a form of regulatory arbitrage to compete against full-charter US banks.

When asked if he’s happy about how the Clarity Act is shaping up, Dimon answered, “No.” The bill is currently headed for a full Senate vote after passing through the Senate Banking Committee earlier this month.