President Donald Trump tells reporters that U.S. service members killed in the conflict with Iran supported his campaign, saying “we cannot let Iran have a nuclear weapon.” Speaking before boarding Air Force One en route to Dover Air Force Base in Delaware for a dignified transfer ceremony, Trump said the four soldiers whose remains were being honored had “very strongly” expressed that position.

The remarks come as at least 18 American service members have been killed since U.S. and Israeli strikes began on February 28, according to the accounts. Trump also defends the ongoing military campaign, stating it is necessary to prevent Iran from obtaining nuclear weapons and disputing polls that show growing public opposition.

At Dover, Trump presides over the transfer of remains of two U.S. Army soldiers identified as Tyler James Feehan (25, Hawaii) and Isabella Gonzales (19, Texas), killed in Iranian missile and drone attacks in Jordan last week. A third service member believed to have been missing from those attacks—Angel S. Rampersad (28, New York)—is also returned. The fourth soldier, Michael Emmanuel Swinton (30, North Carolina), was killed Sunday during a controlled detonation at a military base in Iraq, according to the Pentagon.