Rav Aviner today announced that he cannot support Otzma Yehudit, or support the possible merge with Eli Yishai's Yachad - Ha'am Itanu, due to one factor, despite them being a group that will prevent the continued legislation against the Torah and Judaism. That factor is, the members of Otzma Yehudit, or some of them at least, either go up to har habayit or they support ascending Har Habayit.

Rav Aviner said only if the parties together announce that they are against the ascension to har habayit can he support them.

While I would think that this would be a relatively minor issue, considering the limitations in place and the other major issues that are front and center in these elections, Rav Aviner puts this issue at top priority.

Rav Aviner said that the issue of ascending Har Habayit is not personal, but is one that affects all of Klal Yisrael. He said, this is something that was prohibited by the rabbis of previous generations, and it is not the field of any particular rabbi to allow it. Just like we cannot allow or cause damage to the Torah, we cannot allow or cause damage to Har Habayit.

So, Rav Aviner said, they must denounce ascension to Har Habayit, and if they don't, they should not be cooperated with.

So, the interesting psak is that Rav Aviner says you cannot vote for or support a party that supports going up to Har Habayit.

Dr. Michael Ben Ari and the others have to decide, which is more important to them - Har Habayit or the Knesset. That is, if they want Rav Aviner's support.

source: Srugim