South Korea rejected a United States invitation to President Donald Trump on Wednesday, saying it would take a more “positive approach” toward North Korea if he visits Seoul next month.

The announcement comes after North Korea said it was planning to hold a military drill in the country’s western coastal region on Saturday.

Trump said last week that he would visit South Korea as soon as the president’s South Korean counterpart visits Washington, though no date has been set.

The United States has a longstanding alliance with South Korea, which is technically at war with North Korea.

Trump has criticized China for its alleged trade surreptitious deals with North Korean companies and has threatened to impose tariffs of up to 50 percent on China’s goods.

The White House has said that the North Korean nuclear issue is not a top priority for Trump.