But discussion is under way of the modifications that might be needed to persuade Irish voters to change their minds. A Eurobarometer public opinion survey found that 76 percent of "no" voters believed the negative result would put Ireland in a strong position to negotiate the treaty.
Sinn Féin, the only Irish political party to advocate a no vote, has compiled a list of revisions it would like to see to the treaty. These include workers' rights, protection of public services, and military neutrality.
"Of course the government will say that this list is too ambitious, too detailed, and undeliverable," said Sinn Féin's Caoimhghín Ó Caoláin, a member of the Irish parliament, during a debate on the treaty. "However, already we are hearing from a range of [supportive] voices across the EU, in governments, opposition parties, and social movements."
But Mr. O'Connor, speaking by phone from Brussels, argued that there could be no renegotiation, as that would require a reratification by the 19 countries that have already endorsed it. "Even if you changed one word, it would need reratification," he says.
Instead, Irish voters are likely to be offered clarifying declarations issues that emerged during the referendum campaign, even if some of these are unnecessary.