Midgam conducted a poll that was broadcast by Channel 2 on May 26 2017.
In addition they ran a scenario poll with Ehud Barak at the head of the Zionist Union.

Current Knesset seats in [brackets]

30 [30] Likud
22 [11] Yesh Atid
13 [13] The Joint (Arab) List
12 [24] Zionist Union
09 [08] Bayit Yehudi
07 [10] Kulanu
07 [07] Shas
07 [06] Yahadut Hatorah/UTJ
07 [06] Yisrael Beitenu
06 [05] Meretz
00 [–] Yaalon Party

67 [67] Current Right-Religious Coalition
53 [53] Current Center-Left-Arab Opposition

Scenario Poll with former Prime Minister Ehud Barak leading the Zionist Union

Current Knesset seats in [brackets]

29 [30] Likud
21 [11] Yesh Atid
15 [24] Zionist Union under Barak
13 [13] The Joint (Arab) List
09 [08] Bayit Yehudi
07 [10] Kulanu
07 [07] Shas
07 [06] Yahadut Hatorah/UTJ
07 [06] Yisrael Beitenu
05 [05] Meretz
00 [–] Yaalon Party

66 [67] Current Right-Religious Coalition
54 [53] Current Center-Left-Arab Opposition

Additional Questions:

Of following candidates who is most suited to serve as Prime Minister?

35% Netanyahu, 27% Don’t know, 14% Lapid, 9% Barak, 6% Yaalon, 5% Bennett, 4% Herzog

Are you for a peace deal that is based on 2 states for 2 peoples along 67 borders while maintaining large settlement blocs?

47% Yes, 39% No, 14% Don’t know

Note #1: New look for “KnessetJeremy Polling Average” – The KJPA next to 2017 AVG, 2016 AVG, All Polls & 2015 Election results: https://knessetjeremy.com/knessetjeremy-polling-average-the-israeli-poll-of-polls/