Turkish President Recep Tayyip Erdogan warned that lawmakers in his country may recognize the deaths of Native Americans as a genocide after Congress rebuffed Turkey and voted to acknowledge and condemn the Armenian genocide.

The proposed move, which would be largely symbolic, came after the Senate unanimously passed a bill recognizing the Turkish genocide of more than a million Armenians in the early 20th century.

Erdogan threatened the tit-for-tat while speaking on a pro-government news channel on Monday, according to the Independent.

“We should oppose [the United States] by reciprocating such decisions in parliament. And that is what we will do,” Erdogan said. “Can we speak about America without mentioning [Native Americans]?

“It is a shameful moment in U.S. history,” he added.

Before passing in the Senate, the bipartisan legislation condemning the Armenian genocide was approved in the House by a 405-11 vote. The vote is a direct rebuke to Turkey, which has lobbied against referring to the slayings as a genocide. Between 1915 and 1923, an estimated 1.5 million Armenians died at the hands of the Ottoman Empire.