Senate Foreign Relations Committee member Sen. Marco Rubio, R-Fla., questions Secretary of State John Kerry on Capitol Hill last month. In an interview with NPR, Rubio reiterated his opposition to President Obama's dealings with Iran and Cuba. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

President Obama speaks beside Russian President Dmitry Medvedev after signing New START documents in 2010. Now five years old, that treaty has taken on renewed relevance in light of the framework nuclear deal between the U.S. and Iran. Joe Klamar/AFP/Getty Images hide caption

itoggle caption Joe Klamar/AFP/Getty Images

Cuban President Raul Castro and President Obama shake hands as they meet on the sidelines of the Summit of the Americas in Panama City, Panama, on Saturday. It was the first substantive talk between leaders of the two countries in more than five decades. Pool/Scott Horsley hide caption

itoggle caption Pool/Scott Horsley

President Obama is pressing hard for a nuclear agreement with Iran. But critics have cited his remark that Iran's 'breakout' time for acquiring nuclear material for a bomb might be very brief as parts of the deal expire. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

President Obama speaks to NPR's Steve Inskeep at the White House on Monday. The president is pressing hard for a full-fledged nuclear agreement with Iran, part of his outreach to states that previous presidents ostracized for decades. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

Maranda Brooks stands in January outside a payday loans business that she used to frequent. Troubled by consumer complaints and loopholes in state laws, federal regulators are proposing expansive, first-ever rules on payday lenders, aimed at helping cash-strapped borrowers from falling into a cycle of debt. Tony Dejak/AP hide caption

itoggle caption Tony Dejak/AP

President Obama takes questions from the audience Wednesday after speaking about the economy and the middle class to the City Club of Cleveland. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

Republican Rep. Tom Price, House Budget Committee chairman, said Tuesday that his budget "saves $5.5 trillion, gets to balance within 10 years, without raising taxes." Cliff Owen/AP hide caption

itoggle caption Cliff Owen/AP

U.S. Secretary of State Hillary Rodham Clinton checks her mobile phone in March 2012 after her address to the Security Council at United Nations headquarters. While she's asked the State Department to quickly release her emails from her tenure as secretary, the process likely will take months — dragging out media coverage and critical questions. Richard Drew/AP hide caption

itoggle caption Richard Drew/AP