Turkey is threatening negative diplomatic consequences for a pending Congressional vote on resolution branding the Turks responsible for the Armenian genocide.

A U.S. congressional committee approved the measure Thursday. The 23-22 vote sends the measure to the full House of Representatives, where prospects for passage are uncertain. Minutes after the vote, Turkey withdrew its ambassador to the U.S.

Historians estimate that up to 1.5 million Armenians were killed by Ottoman Turks around the time of World War I, an event widely viewed by scholars as the first genocide of the 20th century. Turkey denies that the deaths constituted genocide, saying the toll has been inflated and those killed were victims of civil war and unrest.

President Barack Obama’s administration had been silent about the resolution until shortly before the vote when it said it opposed its passage. Turkey wants stronger action to block the resolution.

“The picture shows that the U.S. administration did not put enough weight behind the issue,” Davutoglu told reporters. “We are seriously disturbed by the result.”

“We expect the U.S. administration to, as of now, display more effective efforts. Otherwise the picture ahead will not be a positive one,” he said. He complained of a lack of “strategic vision” in Washington.

Turkey denies the history of its ancien regime and doesn’t quite understand the nature of how the US political system operates. They think that Obama can wave his hand and put the resolution to an end. That’s not how it works.