judgment, for senators on either side of the aisle to prejudge the evidence. >> reporter: senator susan collins of maine criticizing mcconnell's vow to work in "total coordination" with the white house in the president's impeachment trial. revealing she is now "open to witnesses" in the coming proceedings. collins, now the second senator to be critical of mcconnell. she follows alaska republican lisa murkowski, who says she is "disturbed" by his comments. on the other side of the aisle, their own potential flip votes to worry about. senator doug jones, a democrat from deep red alabama, up for re-election in 2020. he's now calling on the senate to allow witnesses for "a full, fair and complete trial" in a "washington post" op-ed, but he has signaled he's open to siding with republicans in a final vote. >> if those dots aren't connected and there are other explanations that i think are consistent with innocence, i will go that way, too. >> and kyra phillips is with the president in west palm beach. kyra, removal from office requires a two-thirds vote,