WASHINGTON — President Barack Obama scoffed at the idea that he should apologize to Iran's leaders for criticizing their violent crackdown on demonstrators and said Friday it was President Mahmoud Ahmadinejad who must answer to his own people.

Standing next to German Chancellor Angela Merkel, Obama said the United States and Germany share "one voice" in condemning the Iranian effort to crush dissent. He said Iran's leaders cannot hide the "outrageous" behavior of clamping down violently on their people.

"We see it and we condemn it," Obama said.

Said Merkel: "We will not forget this."

Obama spoke in a joint White House appearance with Merkel after they conferred privately. The two leaders have met three times since Obama took office, allies linked by such international troubles as the war in Afghanistan and a worldwide recession.

Obama said it was too soon to tell how potential direct contact between the United States and Iran will be affected by the recent events. Attempting to break from his predecessor George W. Bush, Obama has sought to loosen the diplomatic freeze with Iran, but that effort is now in question — at best.

Keeping pressure on Iran's rulers, Obama emphasized the rights of the people there.

"Their bravery in the face of brutality is a testament to their enduring pursuit of justice," Obama said.

"The violence perpetrated against them is outrageous. In spite of the government's efforts to keep the world from bearing witness to that violence, we see it and we condemn it."

Merkel backed Obama's stand. And she said Iran must be kept from getting a nuclear weapon.

Iran's violent postelection chaos has captured the world's attention and elicited increasingly sharp condemnations from Obama. Iran's ruling clergy have widened the clampdown on the opposition since a bitterly disputed June 12 presidential election, and scattered protests have replaced the initial mass rallies.

At least 17 people have been killed in a state-led crackdown on protesters.

Incumbent President Ahmadinejad was proclaimed the landslide winner over opposition leader Mir Hossein Mousavi.

Obama's comments on Friday got more direct about the two leaders.

He said Mousavi had captured the spirit and imagination of the Iranian people who want a more free society.

And he dismissed statements by Ahmadinejad, who on Thursday compared Obama to Bush. Obama said he is not meddling in Iran's affairs but rather calling for principles recognized around the world.