"It's not going to deter me from winning the war in Iran. I don't know if that had anything to do with it, I really don't think so, based on what we know," Trump told reporters in a briefing at the White House after the shocking security incident.

Trump had earlier said, however, that "you never know" if it could be linked to the Iran war, and said investigators were working on the motive of the shooter whom he described as a "lone wolf."

The US leader earlier Saturday canceled his envoys' trip to Pakistan for peace talks with Iran, after being unimpressed with Tehran's negotiating position following nearly two months of war.