Photo illustration: Sarah Grillo/Axios. Photos: Win McNamee and Majid Saeedi/Getty Images President Trump is giving Iran's warring factions a short window to unify behind a coherent counter-offer — or the ceasefire he extended Tuesday ends, three U.S. officials tell Axios. "Trump is willing to give another three to five days of ceasefire to allow the Iranians to get their shit together," one U.S. source briefed on the matter said. "It is not going to be open-ended." Why it matters: Trump's negotiators believe a deal to end the war and address what's left of Iran's nuclear program is still achievable. But they also worry they may not have anyone in Tehran empowered to say yes. Supreme Leader Mojtaba Khamenei is barely communicating. The IRGC generals now in control of the country and Iran's civilian negotiators are openly at odds over strategy.…