The U.N.'s special representative in Haiti and a group of influential ambassadors say they support President Michel Martelly amid a state of political flux that many observers worry could set the troubled country back.

The group includes ambassadors of the U.S., E.U and Canada. In a Tuesday statement, it expressed frustration that an extraordinary session of Parliament was not convened in recent days to authorize an electoral law.

It stressed that Martelly enjoys their backing. But the group is "gravely concerned" that Haiti's Parliament has dissolved in dysfunction with no resolution for holding long-delayed legislative elections.

Meanwhile, attorney Andre Michel and other Haitian opposition activists vowed Tuesday to ratchet up disruptive street protests they believe can force Martelly's departure.

Michel told reporters "we're not going to stop until he leaves."