US House of Representatives Speaker Nancy Pelosi starts a tour of four Asian countries on Sunday, her office said, without mentioning Taiwan amid intense speculation she might visit the self-ruled island claimed by China.

“Speaker Nancy Pelosi is leading a Congressional delegation to the Indo-Pacific region, including visits to Singapore, Malaysia, South Korea and Japan,” her office said in a media release.

The release said the visit would include those countries, but did not specify whether Pelosi, who is number 3 in the line of presidential succession, might make other stops.

“The trip will focus on mutual security, economic partnership and democratic governance in the Indo-Pacific region,” it said.

Gregory Meeks, chair of the House Foreign Affairs Committee, was among the delegation listed.

China views visits by US officials to Taiwan as sending an encouraging signal to the pro-independence camp in the island. Washington does not have official diplomatic ties with Taiwan but is bound by law to provide the island with the means to defend itself.