Logan names Palmer vice president. Logan Resigns, Palmer becomes Pres again. I don't think there is any requirement for congress to approve the vice pres.
"In 1973 Vice President Spiro Agnew resigned after pleading "no contest" to a charge of income tax evasion. Under the provisions of the 25th Amendment, President Richard Nixon nominated Gerald Ford as the new Vice President. After an extensive investigation of his finances and personal and public history, both houses of Congress confirmed his appointment and he took the oath of office on December 6, 1973."