ASSOCIATED PRESS WRITER

DAVID BEARD

PORT-AU-PRINCE, Haiti (AP)—Under U.S. pressure to make concessions, Haiti’s prime minister threatened on Wednesday to resign if Haiti’s military chiefs don’t step down as required by a U.N. plan to restore democracy.

Prime Minister Robert Malval’s position further complicated international efforts to push through the plan that envisions the Oct. 30 return of exiled President Jean-Bertrand Aristide.

The head of a parliamentary ‘‘crisis committee’‘ said lawmakers cannot complete their work in time for Aristide’s scheduled return.

U.S. Embassy spokesman Stanley Schrager, however, insisted that the plan was ‘‘still not dead.’‘

U.S. and U.N. mediators presented Malval with a document this week that calls for broadening the interim government he heads so that it would include more of Aristide’s opponents.

The intent of the document was angrily debated with the Clinton administration by Aristide’s supporters, who feel the proposal caves in to the demands of the military leaders.

Malval, speaking in an interview on CNN, said any such political broadening would occur only after the deadline and would include only ‘‘democratic elements,’‘ a clear exclusion of the military leaders.

Six U.S. Navy warships, three Canadian vessels and 10 U.S. Coast Guard cutters are patrolling off Haiti’s coast to enforce a worldwide oil and arms embargo that began Monday to force the army to cooperate. Argentina, the Netherlands, Britain and France are also sending warships.

The U.S. Navy has reported stopping three Haiti-bound ships since the embargo took effect.

The U.N. plan, signed in July, calls for the country’s military authorities to step down before Aristide returns. Aristide was ousted in a September 1991 military coup.

‘‘If on Oct. 30 President Aristide is not in Haiti … This is the end of my mission,’‘ Malval told the Associated Press on Wednesday.

Malval said he did not want to be part of any stalling efforts on the part of Aristide’s opponents.

However, he later said that he would remain if Aristide himself extended the Oct. 30 deadline.

Aristide has said he is committed to the deadline, but Malval said that the president had told him he would not return if army commander Lt. Gen. Raoul Cedras and police chief Lt. Col. Joseph Michel Francois do not step down first.

Schrager, the U.S. Embassy spokesman, said Cedras and Francois have demanded that Malval include four coup supporters in his Cabinet.

In Washington, Aristide refused to discuss the document, but said, ‘‘We are ready to expand the process but first they have to be removed.’‘ Aristide was referring to Cedras, Francois and other military leaders.

An Aristide aide, who spoke on condition of anonymity, said the document was ‘‘a fancy way for the United Nations and the United States to kowtow to these armed thugs and give them what they are seeking.’‘

In the CNN interview, Malval said he believed the aide had misinterpreted a ‘‘minor point’‘ in the document.

‘‘I have nothing in that report which could lead somebody to believe that we are under strong pressure to open up the government to non-democratic elements,’‘ he said.

The Clinton administration believes the Cabinet should be broadened to include business leaders and others outside Aristide’s inner circle, a State Department official said in Washington.

‘‘At no point have we ever discussed power sharing with any anti-democratic element nor do we intend to do so,’‘ U.S. Ambassador William Swing told reporters. He did not clarify whether he referred to all of Aristide’s opponents.

The military leaders insist on a full amnesty for the coup participants before they resign.

A parliamentary ‘‘crisis committee’‘ is working on a general amnesty law and other legislation designed to clear the way for Aristide’s return. But its chairman, Antoine Joseph, told the AP that its work would not be complete by Oct. 30.

Schrager, meanwhile, said on Wednesday that a U.S. military plane was flying in armored vehicles to help protect Malval, whose justice minister was assassinated last week.