Why did Netanyahu vote against a law he wholly embraces?

Netanyahu had his Likud party vote against the citizenship law to embarrass the new Israeli government.

On July 6, the Israeli Knesset failed to renew the Citizenship and Entry Law that prohibits family unification among Palestinians. This is good news. But the suspension of the law was accomplished for all of the wrong reasons. Racist to the core, this apartheid law not only bars Palestinians from the West Bank and Gaza from receiving Israeli citizenship or residency following their marriage to a Palestinian citizen of Israel, but it also forbids them from moving to Israel to live with their Palestinian spouses. First introduced in 2003, the Citizenship and Entry Law was initially framed as a temporary measure enacted to help ensure security. Former Interior Minister Avraham Poraz from the liberal party Meretz who oversaw the passage of the 2003 legislation, noted recently that the law “passed at a time when buses were blowing up across the country”.