WASHINGTON, DC - MARCH 4: Sen. Marco Rubio (R-FL) checks his mobile phone as he arrives for a news conference to introduce a proposal for an overhaul of the tax code, March 4, 2015 on Capitol Hill in Washington, DC. One part of the plan proposes to reduce seven tax brackets for income tax to two: 15 percent and 35 percent. (Photo by Drew Angerer/Getty Images)
