Sen. Mazie Hirono, the Democrat of Hawaii, will join a congressional delegation to Singapore this week led by Sen. John McCain, (R-AZ), who is chairman of the Senate Armed Services Committee.

McCain’s delegation will also visit Vietnam “at a critical time for U.S. interests in the Asia-Pacific region,” according to McCain’s office.

The delegation will mark the 20th anniversary of the normalization of relations with the United States. Sen. Jack Reed (D-RI), ranking member of the Senate Armed Services Committee, Sen. Joni Ernst (R-IA) and Sen. Dan Sullivan (R-AK) are part of the trip.

Singapore.

Flickr: Kah-Wai Lin

In Singapore, the delegation will be joined by Senator Cory Gardner (R-CO). Hirono, a member of Armed Services, is not going on the Vietnam leg.

In Singapore, senators will participate in The Shangri-La Dialogue, billed as “an annual conclave of Asia-Pacific defense ministers and policy makers, including U.S. Secretary of Defense Ashton Carter.”

This year’s summit is expected “to focus on China’s reclamation activities in the South China Sea.”

Last week, McCain, Sullivan and Sen. Brian Schatz, Hawaii’s other Democrat in the chamber, introduced a resolution condemning China’s construction of artificial land formations on the Spratly Islands and called for “a peaceful and multilateral resolution to the South China Sea territorial dispute.”

Schatz is a member of the Senate Defense Appropriations Subcommittee.