According to the Jerusalem Post
...National Union leader Yaakov Katz is expected to be appointed a minister in such a government, representing the four-MK faction in the cabinet. In a deal reached among the parties making up the National Union on December 28, Katz committed himself to resign from the Knesset if he became a minister in order to allow the fifth candidate on the list, American native Uri Bank, become an MK.
"If the list wins four mandates and an MK is appointed a minister, the minister will immediately quit the Knesset to allow Uri Bank to enter," the agreement signed by Katz says.
Uri Bank discussed this eventuality during the counting of military and overseas votes in the Knesset on February 12th.