Rwandan Foreign Minister Louise Mushikiwabo told reporters this week that Rwanda's government would not arrest Bashir if he traveled to Kigali.
She said the ICC had written to Rwanda urging its government to arrest Bashir if he travels there.
Bashir is wanted by the ICC for alleged atrocities in Sudan's Darfur region.
Bashir has recently traveled to other African countries, including attending the inauguration of Uganda's president in May.
Ahead of tomorrow's summit of heads of state, some African countries have renewed efforts to quit the ICC en masse despite the opposition of some countries like Botswana.