He has invited Tzipi into the coalition 3 times now including when he was first declared as PM by Peres so she could have been in the coalition from day 1 but she has let her ego get in the way because she is still bitter that Peres appointed Bibi to be PM rather than her. Shaul Mofaz and other mem bers of her party have constantly criticized her for refusing the offers. Don't worry though I am sure we can find an excuse to pin the blame on Bibi afterall he is the one we all love to hate isn't he?
U.S. warns governments, bankers Iran sanctions still in place (Reuters)
from the article: Israel must topple Netanyahu before it's too late