When active revolution began, he was a member of the New York Provincial Congress, the revolutionary government, from 1775 until 1777. That body, in turn, sent Morris to the Continental Congress for those same years. While in Congress, he was an active supporter of independence and signed the Declaration of Independence in 1776. When warned by his brother Staats Morris, who was a general in the British army, of the consequences that would follow his signing of the rebellious document, Morris stated, "Damn the consequences. Give me the pen."