President Trump Donald John TrumpREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails Trump urges North Korea to denuclearize ahead of summit Venezuela's Maduro says he fears 'bad' people around Trump MORE on Monday marked the Ottoman Turks’ century-old massacre of 1.5 million Armenians, but declined to label it a genocide, keeping with the practice of past administrations.

“Today, we remember and honor the memory of those who suffered during the Meds Yeghern, one of the worst mass atrocities of the 20th century,” Trump said in a statement. “I join the Armenian community in America and around the world in mourning the loss of innocent lives and the suffering endured by so many.”

Previous presidents, including former President Barack Obama Barack Hussein ObamaChicago's next mayor will be a black woman Obama portraits brought more than 1 million visitors to National Portrait Gallery in first year With low birth rate, America needs future migrants MORE, also refused to call the mass killings a genocide. Obama, however, had promised during his election campaign to use the term, while Trump never made such a pledge.

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Trump's statement is an important gesture to Turkey, a NATO ally and key partner in the fight against the Islamic State in Iraq and Syria.

The Turkish government has resisted the genocide label for the actions of the Ottoman forces in 1915, but Armenian-American groups have long urged U.S. presidents to change course. More than 80 lawmakers recently sent a letter to Trump pressuring him to use the term.

“The president's statement fails to stand up for human rights and is inconsistent with American values, and represents the same kind of capitulation to Turkish authoritarianism which will cost more lives," said Anthony Barsamian and Van Krikorian, co-chairs of the Armenian Assembly of America.

The group called for an investigation into “surreptitious Turkish influence on the U.S. government.”

Trump’s statement acknowledged the heated debate over the term genocide.

“We must remember atrocities to prevent them from occurring again,” he said. “We welcome the efforts of Turks and Armenians to acknowledge and reckon with painful history, which is a critical step toward building a foundation for a more just and tolerant future.”

Asked why Trump decided not to use the term, White House press secretary Sean Spicer Sean Michael SpicerFive political moments to watch for at the Oscars Sean Spicer joins 'Extra' as 'special DC correspondent' White House spokeswoman leaving to join PR firm MORE said the statement is "consistent with statements that have been put out for at least several of the last administrations."

Trump has tried to forge a closer bond with Turkish President Recep Tayyip Erdoğan, even phoning him last week to congratulate him on a contested referendum that was criticized as an authoritarian power grab.

The White House later said the two leaders mostly discussed joint counterterrorism efforts.

--This report was updated at 2:03 p.m.