WASHINGTON, D.C. — NATO’s 32 member states will meet in Dayton, Ohio to mark the 30^th anniversary of the Dayton Accords, the agreement that ended the Bosnian War.

Next week’s NATO Parliamentary Spring Session in Dayton comes amid ongoing tensions between the U.S. and its transatlantic allies.

Dignitaries attending include NATO Secretary General Mark Rutte, Ohio Gov. Mike DeWine and Rep. Mike Turner, R-Ohio, who leads the U.S. delegation to the assembly.

Despite Turner’s chief of staff Jason Galanes telling reporters in March that President Donald Trump and Vice President JD Vance were both invited to participate, neither has announced any plans to attend.

Instead, the administration will be represented by Deputy Secretary of State Chris Landau.

For reference, during the last NATO Parliamentary Assembly session in the U.S. in Orlando in 2003, then-President George W. Bush did not attend, but he did host the NATO Secretary General in the Oval Office.

Yet Bush, like every post-WWII president before him, was a staunch supporter of NATO. Trump and Vance have been openly skeptical of the alliance, and Trump has threatened to withdraw the U.S. if other member states do not spend more on defense.

Several European countries have already responded by raising defense spending. Croatia announced plans to boost defense spending from 2% to 3% of GDP by 2030.

On a visit to Washington last week, Croatian Prime Minister Andrej Plenković told Spectrum News that spending would be a focus at the NATO Assembly summit.

“In the altered security and defense context… we are of course now looking how we can increase the spending for defense,” he said. “These are the two main messages. And of course, the importance of the transatlantic partnership and the relationship between the United States and the European allies.”

The White House did not respond to a request for comment on whether the president or vice president would either attend the session in Dayton or host NATO officials in Washington.