The committee said it would be "inappropriate" for either of the two to be able to resume their duties in the House "before the wholesentence imposed by the court has run its course".
Restivo was given a whole life sentence - meaning he would never be released - but this was overturned after an appeal last year and reduced to a life term with a minimum term of 40 years before being eligible for parole.
Lord Lloyd of Berwick said that before the 2003 Criminal Justice Act the home secretary would review a whole-life sentence after 25 years had been served.
Mr Justice Wilkie said that while the men would be eligible for release after serving two-thirds of their sentence, the Parole Board would have the power to keep them in jail for the whole 11 years.