Immigration reform supporters demonstrate in the "Rally for Citizenship" on the West Lawn of Capitol Hill in Washington D.C., capital of the United States, April 10, 2013. Two senior U.S. Senators, Democratic Senator Charles Schumer and Republican Senator John McCain, who are working together to broker an immigration reform plan on Sunday, expressed optimism that a bill could be ready within this week. (Xinhua/Zhang Jun)

Immigration reform supporters demonstrate in the "Rally for Citizenship" on the West Lawn of Capitol Hill in Washington D.C., capital of the United States, April 10, 2013. Two senior U.S. Senators, Democratic Senator Charles Schumer and Republican Senator John McCain, who are working together to broker an immigration reform plan on Sunday, expressed optimism that a bill could be ready within this week. (Xinhua/Zhang Jun)

Immigration reform supporters demonstrate in the "Rally for Citizenship" on the West Lawn of Capitol Hill in Washington D.C., capital of the United States, April 10, 2013. Two senior U.S. Senators, Democratic Senator Charles Schumer and Republican Senator John McCain, who are working together to broker an immigration reform plan on Sunday, expressed optimism that a bill could be ready within this week. (Xinhua/Zhang Jun)

Immigration reform supporters demonstrate in the "Rally for Citizenship" on the West Lawn of Capitol Hill in Washington D.C., capital of the United States, April 10, 2013. Two senior U.S. Senators, Democratic Senator Charles Schumer and Republican Senator John McCain, who are working together to broker an immigration reform plan on Sunday, expressed optimism that a bill could be ready within this week. (Xinhua/Zhang Jun)

Immigration reform supporters demonstrate in the "Rally for Citizenship" on the West Lawn of Capitol Hill in Washington D.C., capital of the United States, April 10, 2013. Two senior U.S. Senators, Democratic Senator Charles Schumer and Republican Senator John McCain, who are working together to broker an immigration reform plan on Sunday, expressed optimism that a bill could be ready within this week. (Xinhua/Zhang Jun)

Immigration reform supporters demonstrate in the "Rally for Citizenship" on the West Lawn of Capitol Hill in Washington D.C., capital of the United States, April 10, 2013. Two senior U.S. Senators, Democratic Senator Charles Schumer and Republican Senator John McCain, who are working together to broker an immigration reform plan on Sunday, expressed optimism that a bill could be ready within this week. (Xinhua/Zhang Jun)

Immigration reform supporters demonstrate in the "Rally for Citizenship" on the West Lawn of Capitol Hill in Washington D.C., capital of the United States, April 10, 2013. Two senior U.S. Senators, Democratic Senator Charles Schumer and Republican Senator John McCain, who are working together to broker an immigration reform plan on Sunday, expressed optimism that a bill could be ready within this week. (Xinhua/Zhang Jun)

Immigration reform supporters demonstrate in the "Rally for Citizenship" on the West Lawn of Capitol Hill in Washington D.C., capital of the United States, April 10, 2013. Two senior U.S. Senators, Democratic Senator Charles Schumer and Republican Senator John McCain, who are working together to broker an immigration reform plan on Sunday, expressed optimism that a bill could be ready within this week. (Xinhua/Zhang Jun)