The world is watching Iran today as thousands of protestors flood Tehran’s streets to protest the outcome of the Islamic nation’s presidential elections.

Supporters of Mir-Hossein Mousavi, whom President Mahmoud Ahmadinejad allegedly defeated, rallied, defying a ban on public protests, and joined the call of Mousavi and other reform advocates to annul the results of Friday’s election, Reuters report. Some reports said Mousavi called off some protests after he was warned that militia thugs would fire live bullets at the crowd. Wearing Mousavi’s green campaign colors and holding pictures of him, they chanted: "Mousavi take back our votes."

They also shouted: "If Ahmadinejad remains president we will protest every day," and, "We fight, we die, we will not accept this vote rigging."

"They are chanting slogans: ‘Death to the dictator,’" one witness told CNN. "We are here. We will not leave the scene until our presence is known."

And in a stunning move, Iran’s Supreme Leader Ayatollah Ali Khamenei, who had originally given a big thumbs-up to the election outcome, now says Iran’s Guardian Council of top clerics and judges will investigate claims made by Mousavi and other reform leaders that the election was rigged.

Ahmadinejad claims he won 62 percent of the vote, despite huge voter turnout — many of whom came from the cities and urban areas that are chock full of young voters and others who want to see Ahmadinejad ousted. Vice President Joe Biden even weighed in Sunday, telling NBC’s "Meet the Press:" "It sure looks like the way they’re suppressing speech, the way they’re suppressing crowds, the way in which people are being treated, that there’s some real doubt about the result," he said. Reporters Without Borders is urging nations to not recognize the results, pointing to reporter detention and physical abuse, as well as censorship, as just a few more reasons Ahmadinejad’s government is too abusive to stay.

The elections are also a hot topic on Twitter. Many American news watchers Twittered about their frustration over a perceived lack of coverage of Iran on CNN, notes The Wall Street Journal. "#CNNfail" became one of the top 10 trends on Twitter over the weekend.

Ahmadinejad isn’t the only man in the Middle East making news today. Israeli Prime Minister Benjamin Netanyahu laid out his vision for how to reach peace with the Palestinians on Sunday, during which time he agreed to the establishment of a Palestinian state (albeit, a demilitarized one that won’t attack Israel). Reactions are mixed today, with Egypt saying Netanyahu’s call falls short of what’s needed. Many Palestinians also rejected Netanyahu’s idea, saying it had "closed the door" on any hope of agreement.

Here’s video of protests against the election outcomes held in Tehran and other cities:

Watch Vice President Biden talk about Iran’s election results below: