JERUSALEM (AP) _ Prime Minister Ehud Barak's coalition government appeared to be collapsing on the eve of the Camp David summit as his biggest coalition partner, the Shas party, said Sunday it planned to bolt the government.

The move, which ministers said would be announced at a news conference later Sunday, would further weaken Barak as he heads to the make-or-break summit and seriously threaten his ability to achieve a consensus on peace.

``Our ministers are resigning from the government and we are withdrawing from the coalition,'' Shas party spokesman Yitzhak Soudri told The Associated Press.

The move came hours after Natan Sharansky, the former Soviet dissident, withdrew his own right-wing party over feared concessions to the Palestinians at Camp David.