Interim President Robert Michelletti has proposed allowing ousted President Zelaya to return with amnesty – as long as he steps down as leader.
Before the president was deposed, Elvin Santos seemed likely to win November's election. Now protesters pelt him with insults and eggs.
Roberto Micheletti said ousted President Manuel Zelaya would be jailed if he came back to Honduras. He also accused the US Ambassador Hugo Llorens of tilting unfairly in favor of Zelaya.
One month after Costa Rica's president arrived to negotiate an end to the standoff, most of Honduras's top leaders are steadfastly opposed to the return of deposed president Zelaya.
Manuel Zelaya's visit with President Calderón could mark a new strategy to distance himself from his leftist ally, Hugo Chávez.
Washington's move is meant to prod coup's architects to resolve the political crisis.
Exiled President Zelaya has set up camp on the Nicaraguan border to keep up pressure on interim government.
Deposed President Zelaya now says he will return Friday. Honduras's interim leader has refused to allow Zelaya back.
Chief mediator Oscar Arias asked for a 72-hour extension and warned of civil war after talks broke down Sunday.