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US Secretary of State Hillary Rodham Clinton (C) writes on her cell phone with Roberta S. Jacobson (L), US Assistant Secretary of State for Western Hemisphere Affairs,  and US Ambassador to Brazil Thomas Shannon  (R) in Brasilia, Brazil, before heading to Brussels on Tuesday April 17, 2012.
US Secretary of State Hillary Rodham Clinton (C) writes on her cell phone with Roberta S. Jacobson (L), US Assistant Secretary of State for Western Hemisphere Affairs,  and US Ambassador to Brazil Thomas Shannon  (R) in Brasilia, Brazil, before heading to Brussels on Tuesday April 17, 2012.

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    Sen. Barbara Boxer speaks out on Clinton emails

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Sen. Barbara Boxer speaks out on Clinton emails

In an interview with CNN's Jake Tapper, Democratic Sen. Barbara Boxer of California said Clinton's emails had more study than a chest X-ray.

Sen. Barbara Boxer speaks out on Clinton emails

In an interview with CNN's Jake Tapper, Democratic Sen. Barbara Boxer of California said Clinton's emails had more study than a chest X-ray.