but the senate's most powerful republican is also pushing back. arguing that the intelligence is correct, and an investigation is needed. >> i agree with senator schumer, chairman mccain, burr, and others, this cannot be a partisan issue. the russians are not our friends. >> reporter: and now the clinton campaign is backing a demand from electoral college electors for a full intelligence briefing on the matter ahead of their official vote december 19th. this amid questions of trump's likely pick for secretary of state, rex tillerson, and his close ties to putin and russia. florida senator marco rubio, who sits on the senate foreign relations committee, tweeting being a friend of vladamir is not an attribute i'm hoping for from a secretary of state. these battles being waged as trump continues to shape his upcoming administration. making trips to trump tower today -- >> really cool stuff in his office. >> reporter: former presidential candidate carl carl, former