Obama Reluctant to Toughen Stance on Iran: Via NYTimes.com .

WASHINGTON — With Iran on a razor’s edge after a week of swelling protests, the Obama administration has fended off pressure from both parties to respond more forcefully to the disputed election there. But if Iranian authorities carry out their latest threat of a more sweeping crackdown, the White House would reconsider its carefully calibrated tone, officials said Friday.

Administration officials said events this weekend in Tehran — when demonstrators plan to rally in defiance of the authorities — would be a telling indicator of whether President Obama would join European leaders and lawmakers on Capitol Hill in more harshly condemning the tactics of the Iranian government.

Congressional Republicans and conservative foreign-policy experts stepped up their pressure on the White House to take a firmer stand in support of the demonstrators, even as Mr. Obama worked to keep Democrats from breaking openly with him on Iran.

For now, administration officials said they had not been swayed by criticism that Mr. Obama’s refusal to speak out more had broken faith with democracy advocates in Tehran, or by the fact that European leaders and even members of his own party in Congress had responded more assertively than he had.

In an interview with CBS News on Friday, Mr. Obama spoke cautiously about warnings by Iran’s supreme leader, Ayatollah Ali Khamenei, of bloodshed if the protests go on. “I’m very concerned, based on some of the tenor and tone of the statements that have been made, that the government of Iran recognize that the world is watching,” Mr. Obama said.

Mr. Obama, officials said, was determined to react to events as they unfold, rather than make statements that might play well politically but hinder his longer-term foreign-policy goals. The administration still hopes to pursue diplomatic engagement with Iran on its nuclear program.

Still, one senior official acknowledged that a bloody crackdown would scramble the administration’s calculations. The shadow of Tiananmen Square — in which Chinese tanks and troops crushed a flowering democracy movement in Beijing — has hung over the White House this week.

Mr. Obama continued to face pressure at home not to miss an opportunity to align the United States with a potentially historic shift in Iran. On Friday, both houses of Congress threw full support behind the rights of protesters to challenge the election results. In the House, lawmakers voted 405 to 1 to adopt a nonbinding resolution condemning the violence against demonstrators. The Senate passed a similar resolution later in the day.

“This resolution is not about American interests,” said Representative Howard L. Berman, a California Democrat who is the chairman of the House Foreign Affairs Committee. “It’s about American values, which I believe are universal values: the values of the rule of law; of participatory democracy; about individual liberty and about justice.”

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