U.S. military aircraft crashes along Kazakh and Kyrgyz border.
Marco Rubio continues push for immigration bill.
30,000-pound bunker buster, which could destroy Iranian nuclear sites, makes its debut.
Students suspended over 'twerking' video.
Marathon bombers considered suicide bombings, attacks on July 4.
Always cautious: Obama downplays Hagel's comments about arming Syria's rebels.
Hotness for the Weekend: 'Get Lucky' by Daft Punk.