SEOUL — South Korea's President Yoon Suk Yeol boycotted the formal opening of his country's parliament on Monday as his squabbles with the opposition deepen over allegations of wrongdoing by top officials and his wife.

It's a tradition for South Korean presidents to deliver a speech at opening ceremonies for National Assembly sessions, and Yoon is the first to skip the event since the East Asian country's transition from a military dictatorship to democracy in the late 1980s.

Yoon, a conservative who was narrowly elected in 2022, has struggled to navigate a parliament controlled by liberals who have stymied his agenda and called for investigations into allegations of corruption and abuse of power involving his spouse Kim Keon Hee and government officials.

Yoon also faces declining approval ratings as concerns grow over his government's ability to deal with a worsening job market, soaring household debt and a prolonged strike by thousands of doctors that is straining medical services.

Asked about his decision to skip the ceremony, Yoon's office said lawmakers must first "normalize the National Assembly, which overissues demands for special prosecutor investigations and impeachments," before inviting the president.

Jo Seoung-lae, spokesman for the main opposition Democratic Party, said Yoon's refusal to attend displayed his "arrogance" and disregard for the legislature's role to check and balance the executive branch.

"It's impossible to produce results in national governance without having respect for the National Assembly," Speaker Woo Won-shik said during the ceremony as he lamented Yoon's absence.

Following parliamentary elections in April, in which the liberals extended their majority, the current assembly began meeting in May. But its official opening ceremony was delayed for months because of political bickering.

Opposition lawmakers are pushing for an investigation by special prosecutors into allegations that top government and military officials tried to cover up the circumstances surrounding the death of a Marine who drowned during a search for flood victims in 2023. They want another independent investigation into allegations that the first lady was involved in stock price manipulation and other wrongdoing. Yoon has denied the accusations.

Yoon's office, which rejected a previous bill calling for special prosecutors to investigate the Marine's death, described the allegations as groundless and politically motivated.

Yoon and his party also criticized the opposition's move to hold a parliamentary hearing in July to address online petitions signed by tens of thousands calling for his impeachment.

South Korea's Constitution limits a president to a single five-year term, so Yoon cannot seek reelection.