Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Trump Calls Iranian Shootdown of US Drone 'New Fly in the Ointment' Jeff Seldin Carla Babb, Steve Herman, Katherine Gypson, Ken Bredemeier contributed to this report. WASHINGTON -- U.S. President Donald Trump called Iran's shootdown of a U.S. drone over the Strait of Hormuz a "very bad mistake," saying it will further complicate an already tense showdown between Washington and Tehran. "This is a new fly in the ointment," Trump told reporters Thursday while meeting with Canadian Prime Minister Justin Trudeau at the White House. "This drone was in international waters, clearly. We have it all documented scientifically not just words," Trump said. "They made a very bad mistake." Earlier, the president wrote on Twitter, "Iran made a very big mistake!" Iran made a very big mistake! -- Donald J. Trump (@realDonaldTrump) [1]June 20, 2019 But during the meeting with his Canadian counterpart, Trump seemed to try to soften his rhetoric. "It could have been somebody that was loose and stupid," he said of whoever ordered the attack. He also said, "It would have made a big, big difference" had Iran shot down a manned U.S. aircraft. Earlier Thursday, Iran's Revolutionary Guard claimed to have shot down the U.S. RQ-4 Global Hawk drone over Iranian airspace. "Borders are our red line," Revolutionary Guard commander Gen. Hossein Salami told a crowd in the western city of Sanandaj, in a televised address. "`Any enemy that violates the borders will be annihilated." But U.S. Air Forces Central Command, which oversees U.S. military activity in the region, said the Iranian claim was "categorically false." "This was an unprovoked attack on a U.S. surveillance asset that had not violated Iranian airspace at any time during its mission," Lt. Gen Joseph Guastella said in a statement he read to reporters at the Pentagon. Guastella said the drone was flying a surveillance mission over international airspace and was 34 kilometers from the Iranian coastline when it was shot down. "This attack is an attempt to disrupt our ability to monitor the area following recent threats to international shipping and free flow of commerce," Guastella said, adding it could have put civilian aircraft flying in established air corridors between the United Arab Emirates and Oman in danger. References 1. https://twitter.com/realDonaldTrump/status/1141711064305983488?ref_src=twsrc%5Etfw .