In a normal election, you’d think that a video of a Presidential candidate talking about sexual assault would fatal for the candidate’s campaign. But this election cycle has been anything but normal. So, with Trump’s campaign in crisis, I thought it would be interesting to maintain a roll call of which Republican Senators have said enough is enough and will no longer support Trump. I intend to update this table as new information becomes available.
Most of the information in the initial version of this post came from The Atlantic.

State	Name	Up for Re-Election?	Endorses Trump?	Plans to Vote for Trump?	Calls for Trump to Step Down?
Alabama	Richard Shelby	2016
Alabama	Jeff Sessions	2020	NAY	NAY	YEA
Alaska	Lisa Murkowski	2016	NAY	NAY	YEA
Alaska	Dan Sullivan	2020	NAY	NAY	YEA
Arizona	John McCain	2016	NAY	NAY
Arizona	Jeff Flake	2018	NAY	NAY	YEA
Arkansas	John Boozman	2016	YEA	YEA	NAY
Arkansas	Tom Cotton	2020	YEA	YEA
Colorado	Cory Gardner	2020	NAY	NAY	YEA
Florida	Marco Rubio	2016	YEA	YEA
Georgia	Johnny Isakson	2016	YEA	Undecided / Unknown
Georgia	David Perdue	2020	YEA
Idaho	Mike Crapo	2016	NAY	NAY	YEA
Idaho	Jim Risch	2020	Unknown	Unknown	Unknown
Illinois	Mark Kirk	2016	NAY	NAY	YEA
Indiana	Dan Coats	2016	YEA	YEA
Iowa	Chuck Grassley	2016	Unknown	Unknown	Unknown
Iowa	Joni Ernst	2020	YEA	Unknown	Unknown
Kansas	Pat Roberts	2020			NAY
Kansas	Jerry Moran	2016			NAY
Kentucky	Mitch McConnell	2020		YEA	NAY
Kentucky	Rand Paul	2016		YEA	NAY
Louisiana	David Vitter	2016			NAY
Louisiana	Bill Cassidy	2020			NAY
Maine	Susan Collins	2020	NAY	NAY
Mississippi	Thad Cochran	2020		YEA
Mississippi	Roger Wicker	2018	YEA	YEA
Missouri	Roy Blunt	2016		YEA
Montana	Steve Daines	2020
Nebraska	Deb Fischer	2018	NAY	NAY	YEA
Nebraska	Ben Sasse	2020	NAY	NAY	YEA
Nevada	Dean Heller	2018	NAY	NAY	YEA
New Hampshire	Kelly Ayotte	2016	NAY	NAY
North Carolina	Richard Burr	2016	Undecided	Undecided	Undecided
North Carolina	Thom Tillis	2020			NAY
North Dakota	John Hoeven	2016			NAY
Ohio	Rob Portman	2016	YEA	YEA	NAY
Oklahoma	Jim Inhofe	2020	YEA	YEA	NAY
Oklahoma	James Lankford	2016			NAY
Pennsylvania	Pat Toomey	2016	NAY	Undecided	NAY
South Carolina	Lindsey Graham	2020	NAY	NAY
South Carolina	Tim Scott	2016		YEA
South Dakota	John Thune	2016	NAY	NAY	YEA
South Dakota	Mike Rounds	2020			NAY
Tennessee	Lamar Alexander	2020	YEA
Tennessee	Bob Corker	2018		YEA	NAY
Texas	John Cornyn	2020	YEA	YEA	NAY
Texas	Ted Cruz	2018	YEA	YEA	NAY
Utah	Orrin Hatch	2018	YEA	YEA	NAY
Utah	Mike Lee	2016	NAY	NAY	YEA
West Virginia	Shelley Moore Capito	2020	NAY	NAY	YEA
Wisconsin	Ron Johnson	2016	YEA	YEA	NAY
Wyoming	Mike Enzi	2020
Wyoming	John Barrasso	2018

Update Sat 8-Oct-16 8:23PM PDT: Added many values (too many to list here) to many of the blank cells; added links from many of the table’s cells to news websites supporting the values in individual cells.
Update Sat 8-Oct-16 4:09PM PDT: Added column listing when each Republican Senator is up for re-election.
Update Sat 8-Oct-16 4:48PM PDT: Added columns listing whether each Senator endorses Trump and whether each Senator has called for Trump to step down. Also added many links to sources supporting the information in this table.