Japanese Prime Minister Kishida Fumio said Tuesday his governing party’s major defeat in last weekend’s by-elections was largely due to a political fundraising scandal and that he would not step down or replace party executives to take responsibility.

Instead, Kishida said he will push anti-corruption measures and political reforms.

“As I take the results seriously, I believe as president of the governing party we must tackle the challenges we face one by one and achieve results, and this is the way I will take responsibility,” Kishida said. “By doing so, I will regain the people’s trust.”

Kishida said the scandal dealt “a big and heavy hinderance” to the party. The scandal centers on dozens of legislators in Kishida’s Liberal Democratic Party (LDP) who allegedly pocketed profits from ticket sales to political events by falsifying accounting reports.

The conservative LDP lost all three seats in Sunday’s parliamentary by-elections in Nagasaki, Shimane, and Tokyo. Kishida’s party only fielded its own candidate in Shimane, a conservative stronghold, while the liberal-leaning main opposition Constitutional Democratic Party of Japan clinched all three seats previously held by the LDP.

The loss is seen as a punishment by voters for the governing party’s scandal, which erupted last year and has undermined Kishida’s leadership.

Asked if he would take responsibility for the election loss, Kishida denied he would step down or replace top LDP posts, and pledged to pursue party and political reforms, including a revision to the laws regulating political funds. He also vowed to tackle economic issues.

The party is unlikely to lose power because the opposition is fractured. But Sunday’s defeat marks a further setback for Kishida, who will seek reelection as his party’s leader in the fall.

Political analysts say Kishida was hoping to call a snap election possibly after the current parliamentary session ends in late June, seeking to receive a public mandate, and then win another term in the party presidential vote in September.

Kishida’s state visit to the United States earlier this month was perceived as a success, but Sunday’s losses could erode his clout and LDP legislators may try to bring him down in favor of a fresh face ahead of the next general election.

Such a move would make it difficult for Kishida to run for another three-year term in the party’s presidential race in September. As prime minister, he can call a snap election anytime before the current term for the lower house expires in October 2025.

Kishida on Tuesday denied he has plans to call for a snap election.

He has fought plummeting approval ratings since the corruption scandal broke. He has removed a number of Cabinet ministers and others from party executive posts, conducted internal hearings, and drafted reform measures, but support for his government has dwindled to around 20 percent.

The scandal centers on unreported political funds raised through tickets sold for party events and involved more than 80 LDP legislators, mostly belonging to a major party faction previously led by assassinated former Prime Minister Abe Shinzo. Ten people – legislators and their aides – were indicted in January.