Haiti Prime Minister Garry Conille has resigned from office, giving into political pressure from President Michel Martelly to step down.

Conille sent a letter to Martelly shortly after 10 a.m. Friday, almost an hour before he was supposed to meet with the president and ministers at the National Palace, several sources confirmed.

For days, Conille, a former UN diplomat and gynecologist, had been under pressure to step down, with presidential advisers delivering the request in person. On Thursday, rumors circulated that Martelly would formally ask for Conille’s resignation in a letter.

The international community, influential business leaders and top Haitian politicians had been scrambling for days to prevent a political confrontation that could lead to the ouster of Conille just four months after he took office. But all their efforts failed.

The presidents of both the lower chamber of Parliament and the Senate told diplomats and Conille that they were opposed to the ouster, and feared that it would deepen the crisis in Haiti. But others say that with the president and prime minister unable to see eye-to-eye, Haiti was facing a crisis of governance.

Conille and Martelly have been at loggerheads over nationality issues of government officials, an investigation of $300 million in post-earthquake contracts and who controls government ministers.

On Thursday, as speculation spread about whether the prime minister would stay or go, the head of the U.N. peacekeeping mission in Haiti read a statement on what the mission called “a series of repeated crises between the executive and legislative powers that undermine the proper functioning of the institutions and the democratic process,” over the past few weeks.

“The political deadlock and institutional paralysis between the government, Parliament and the president does not reflect the commitments they have undertaken vis-à-vis the Haitian people and are not likely to create the necessary conditions for recovery of the economy and the consolidation of democracy,” Mariano Fernandez, special representative of the U.N. Secretary-General and head of the mission in Haiti, said in a statement.

As Fernandez spoke, government ministers and their chiefs of staff were complying with a Senate commission investigating the nationality of government ministers.

In his statement, Fernandez said “2012 could prove a turning point for Haiti in terms of reconstruction, economic growth, investment and strengthening of political institutions and governance.”