Marco Rubio celebrates onstage with his family in 2010 after winning his U.S. Senate seat in Florida when he was just 39 years old. Now, he's expected to embark on a run for president. Alan Diaz/AP hide caption

itoggle caption Alan Diaz/AP

Canadian athletes hold up the national flag during the 2014 Winter Olympics in Sochi, Russia. Sen. Ted Cruz was born in Calgary, and some question his eligibility to run for president in the U.S. Darron Cummings/AP hide caption

itoggle caption Darron Cummings/AP

Sen. Ted Cruz, R-Texas, arrives Sunday for a walk-through for his Monday speech at Liberty University in Lynchburg, Va., in which he is expected to formally launch his campaign for president. Andrew Harnik/AP hide caption

itoggle caption Andrew Harnik/AP

Sen. Ted Cruz, his wife, Heidi, and their two daughters Catherine (left) and Caroline practice waving on stage at Liberty University before Cruz's Monday presidential campaign launch. Andrew Harnik/AP hide caption

itoggle caption Andrew Harnik/AP

President Obama with Israeli Prime Minister Benjamin Netanyahu at the White House in 2013. The two have never had a warm and fuzzy relationship. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

Tom Cotton, R-Ark., the freshman senator and Harvard graduate senator with a record of tough talk on foreign policy. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

President Obama is shown in the Oval Office in the White House March 3, where he spoke about yet another topic: Iran and Israeli Prime Minister Benjamin Netanyahu's speech to Congress. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

Hundreds of union members rally outside the Capitol in Madison on Tuesday to oppose a Republican-led measure that would make Wisconsin a right-to-work state. Reuters/Landov hide caption

itoggle caption Reuters/Landov