US Secretary of State Marco Rubio has emphasized a diplomatic approach to Iran, saying he wasn't going to speak about a military attack and that President Donald Trump "has made it clear he prefers diplomacy." Speaking at a joint press conference in Bratislava with Slovak Prime Minister Robert Fico on February 15, Rubio said that "no one has ever been able to do a successful deal with Iran, but we are going to try." Rubio is in Slovakia for one day as part of a broader European tour focused on strengthening ties with key allies. "Right now, we…