Sen. Lindsey Graham waits to begin a hearing on Capitol Hill in Washington, DC. Pool/Getty Images Sen. Lindsey Graham died on Sunday at the age of 71. The senator's office confirmed his death after a "sudden illness." Graham was key in shaping Trump-era policies like lower corporate tax rates and tariffs. Republican lawmaker Lindsey Graham, who died on Saturday at the age of 71, had a major influence on corporate tax rates, tariff policies, and defense spending. Graham's office said in a…