2020 US Senate Election- Could Democrats end up with 67 seats?

35 Democratic US Senate seats not up for re-election in 2020.
Democrats will win every Democratic held US Senate seat up in 2020.
36)MA(Markey-D)
37)RI(Reed-D)
38)NJ(Booker-D)
39)IL(Durbin-D)
40)DE(Coons-D)
41)OR(Merkley-D)
42)NM(OPEN Udall-D) Lujan-D
43)VA(Warner-D)
44)MN(Smith-D)
45)MI(Peters-D)
46)NH(Shaheen-D)
47)AL(Jones-D)
Democrats need to win 20 Republican held US Senate seats up in 2020.
48)CO(Gardner-R) Johnston-D
49)AZ(McSally-R) Kelly-D
50)ME(Collins-R) Pingree-D
51)NC(Tillis-R) Erica Smith-D
52)GA(Perdue-R) Tomlinson-D
53)IA(Ernst-R) Greenfield-D
54)KY(McConnell-R) McGrath-D
55)TX(Cornyn-R) Hegar-D
56)MS(Hyde Smith-R) Espy-D
57)MT(Daines-R) Wilmot Collins-D
58)KS(OPEN Roberts-R) Grissom-D
59)TN(OPEN Alexander-R) Mackler-D
60)SC(Graham-R) Harrison-D
61)AK(Sullivan-R) Dunbar-D
62)LA(Cassidy-R) Mitch Landrieu-D
63)SD(Rounds-R) Brendan Johnson-D
64)NE(Sasse-R) Beutler-D
65)AR(Cotton-R) Mahoney-D
66)WV(Moore Capito-R) Swearengin-D
67)WY(OPEN Enzi-R) Freudenthal-D

The maximum number of US Senate seats the Democrats will end up with after 2020 is 57.