US President George W. Bush said Tuesday the US and Europe must rally to keep Iran from developing a nuclear weapon, calling the threat an incredible danger to world peace. Speaking in Slovenia at his final EU-US summit, Bush said of Iranian leaders: "they can either face isolation, or they can have better relations with all of us. ... Now's the time for all of us to work together to stop them." Bush said the US and its European allies should work together to make that choice clear to Iran. Bush and EU leaders were poised to threaten Iran with further financial sanctions unless it verifiably suspends its nuclear enrichment. They said Iran must fully disclose any nuclear weapons work and allow the International Atomic Energy Agency to verify that work.