WARSAW -- Polish President Wojciech Jaruzelski's reluctance to provide the precise dates for a previously announced White House visit has fueled speculation here that he plans to resign soon.

Jaruzelski, the general who imposed martial law in 1981 and the most senior former Communist in the Solidarity-led government, had accepted an invitation from President Bush to visit Washington next month.

Last month, Jaruzelski's office had said he would go to Washington around Oct. 11. But on Wednesday, his office refused to give a date for the trip and insisted that no firm plans had been made.

The proposed visit has become a complicating factor in setting the schedule for proposed presidential and legislative elections. Those elections are expected to sweep nearly all former Communists from the Polish legislature.

Solidarity union leader Lech Walesa, a candidate for the presidency, has demanded Jaruzelski's prompt resignation to allow elections by the end of the year. Supporters of Walesa's likely rival for the presidency, Prime Minister Tadeusz Mazowiecki, also have demanded that Jaruzelski step down immediately.

Jaruzelski was elected in June 1989 for a six-year term as part of a power-sharing agreement between the Communist government and the Solidarity opposition. He is the most senior former Communist still in office in Eastern Europe.

Jaruzelski has said he is ready to resign when the parliament requests it, but has said he will not be chased out of office.

A schedule for the elections is expected from a meeting called for Tuesday by the country's Roman Catholic primate, Cardinal Jozef Glemp. Jaruzelski, Mazowiecki and other leaders are expected to attend.