Washington, Ramadan 21, 1436, Jul 8, 2015, SPA -- The Obama administration warned Europe on Wednesday that allowing a financial and economic meltdown in Greece would be a major geopolitical error. U.S. Treasury Secretary Jacob Lew said he has been in constant contact with European officials regarding the Greek debt crisis that threatens to push Athens out of the euro zone and increase difficulties for the Greek people. "There's a lot of unknowns if this… completely melts down in Greece," Lew said at an event on U.S. financial stability. "I think that unknown is a risk to the European and global economy, … [and] I think it's geopolitically a mistake." --SPA 19:42 LOCAL TIME 16:42 GMT www.spa.gov.sa/w