Rule 9 - Delayed or Successive Motions(a) Delayed Motions. A motion for relief made pursuant to these rules may be dismissed if it appears that the government has been prejudiced in its ability to respond to the motion by the delay in its filing, unless the movant shows that the motion is based on grounds of which he or she could not have known by the exercise of reasonable diligence before the circumstances prejudicial to the government occurred.(b) Successive Motions. A second or successive motion may be dismissed if the judge finds that it fails to allege new or different grounds for relief and the prior determination was on the merits or, if new and different grounds are alleged, the judge finds that the failure of the movant to assert those grounds in a prior motion constituted an abuse of the procedure governed by these rules.