After the U.S., Britain and France carried out airstrikes in Syria early Saturday, the Massachusetts all-Democratic congressional delegation is criticizing President Trump’s decision to take action without congressional authorization.

Trump ordered the strikes in response to a suspected chemical weapons attack by Syrian President Bashar Assad last week. While the representatives criticized the action carried out, they all expressed the need to hold Assad accountable.

Sen. Elizabeth Warren said the U.S. should be part of a strategy to hold Assad accountable for violence against the Syrian people, but said if Trump “wants to expand American military involvement in Syria’s civil war, he must seek approval from Congress.”