Thomson Reuters Oil prices jumped nearly 2% early Monday. President Donald Trump warned Iranian President Hassan Rouhani late Sunday with "CONSEQUENCES THE LIKES OF WHICH FEW THROUGHOUT HISTORY HAVE EVER SUFFERED BEFORE" after the Iranian leader said a US-Iran conflict would be the "mother of all wars." Watch oil trade in real time here. Oil prices rose Monday after President Donald Trump delivered Iranian President Hassan Rouhani a frenzied threat on Twitter, promising in all-caps that Iran would suffer grave "consequences" if it continued to threaten the US.