Dick Cheney, a central force behind the 2003 U.S. invasion of Iraq and regarded as one of the most powerful vice presidents in U.S. history, died at 84 on Monday from complications of pneumonia and cardiac and vascular disease, his family said Tuesday.

A former Wyoming congressman and secretary of defense, Cheney helped expand presidential power as vice president from 2001 to 2009 and built a national security team that became its own power center. He vigorously advocated for the Iraq war, warning of weapons of mass destruction that were never found, and defended “enhanced” interrogation techniques that others called “torture.” He clashed with several top aides, including Secretaries of State Colin Powell and Condoleezza Rice.

Cheney’s daughter Liz lost her House seat after opposing Dona

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