As Pelosi starts Asia tour, China warns of military action if she visits Taiwan

House Speaker Nancy Pelosi kicked off an Asia tour Monday that's been shrouded in secrecy following an escalation in tensions with China over Taiwan.

With no word on whether Pelosi will visit the island, she stopped first in Singapore, where Prime Minister Lee Hsien Loong urged her at a meeting to strive for "stable" ties with Beijing.

Her itinerary also includes Malaysia, South Korea and Japan, but a possible Taiwan visit has dominated attention in the run-up.