President Donald Trump demanded Tuesday that Georgia “call off” its upcoming runoff elections over his claims of fraud, giving Republicans a new headache in their fight to keep control of the U.S. Senate.Repeating his attacks about mail-in voting, Trump angrily urged Republican Gov. Brian Kemp to “do something” about absentee votes that are expected to be cast predominantly by Democrats in the pair of make-or-break Senate contests.“You allowed your state to be scammed,” Trump warned Kemp on Twitter, presumably referring to the presidential election.“Call off election. It won’t be needed. We wi…