he, obviously, is joyful about being reunited with his family. >> reporter: republican senator marco rubio of florida, a cuban american, blasted the president's announcement. >> the cuban people aren't any more free today than they were yesterday. >> reporter: but president obama cannot end the longstanding embargo with cuba because that requires congressional approval. >> karen, thank you. they'll release an exchange for three cuban agents. the men were greeted by raul castro as they stepped off of a plane in havana yesterday. they were arrested in 1998 and later convicted of spying on anti-castro groups in miami. stay with abc news as we cover the far-reaching impact of the accord with cuba. full reaction on "america this morning" and "good morning america." we may get a look at boston bombing suspect dzhokhar tsarnaev. it would be the first time we've seen him since last year. he's expected to be in court for the final lawyer conference before his trial set to start