Iran's president warned today that European soldiers in the Middle East "could be in danger" after three nations — Britain, France and Germany — challenged Tehran over breaking the limits of its nuclear deal, the AP reports.

Why it matters: President Hassan Rouhani's remarks in a televised Cabinet meeting represent the first direct threat he's made to Europe.

Sen. Tim Kaine (D-Va.) said Tuesday that he's secured the 51 Senate votes needed to pass a revised version of his war powers resolution, which would require President Trump to seek approval from Congress before taking further military action against Iran, per the AP.

Why it matters: The bipartisan resolution, which has the backing of Sens. Mike Lee (R-Utah), Rand Paul (R-Ky.), Susan Collins (R-Maine) and Todd Young (R-Ind.), illustrates the degree to which the Trump administration's actions against Iran have tested the president's Republican allies.

The leaders of the U.K., Germany and France said in a Tuesday letter that they are triggering a "dispute mechanism" in the Iran nuclear agreement in response to Tehran’s attempts to undo parts of the deal, the AP reports.

Why it matters: The action could lead to the restoration of European sanctions on Iran that were rolled back in 2015.

Protesters stared down Iranian riot police in at least two cities as demonstrations over the downing of a Ukrainian passenger plane entered a third day, the New York Times reports.

Driving the news: Amid the protests, Iranian authorities announced the arrests of "some individuals" over the crash — without specifying who or how many — and Iranian President Hassan Rouhani called for the creation of a special court regarding the incident, per the AP.

Twelve days in which war between the U.S. and Iran seemed to loom ever closer began and ended with apparent Iranian mistakes.

The big picture: Iran is under growing pressure at home and abroad, while President Trump appears emboldened. But Trump is also facing criticism in Washington for failing to substantiate claims of an "imminent" threat, and overseas for his role in driving the escalation.

Iranian protesters have taken to the streets for a second day, calling for Supreme Leader Ayatollah Ali Khamenei's resignation after the government admitted to accidentally shooting down a Ukrainian passenger plane, killing all 176 people on board, Reuters reports.

The latest: Security forces used tear gas, rubber bullets and live ammunition to break up protests in Tehran on Sunday, per the New York Times, which notes demonstrations have spread to other cities across the country.

Iranian riot police and members of the Islamic Revolutionary Guard Corps were out in force Sunday as mass protests continued over the downing of a Ukrainian commercial jet, with demonstrators mourning the 176 victims and demanding the resignations of top government officials, AP reports.

Why it matters: Human rights groups believe Iran killed hundreds of protestors in November when demonstrations over increased oil prices broke out.

Kimia Alizadeh, the first and only Iranian woman to win an Olympic medal, announced on Instagram Saturday that she has permanently left her home country, condemning the Iranian government for its "corruption and lies."

What she's saying: The 21-year-old Alizadeh, who won the bronze medal in taekwondo at the 2016 Summer Olympics in Rio, said she would always remain a "daughter of Iran," but that she could no longer sit at the regime's "table of hypocrisy, lies, injustice and flattery," according to a CNN translation.

56% of Americans say they disapprove of President Trump's handling of heightened tensions with Iran, according to an ABC News poll conducted by Ipsos Public Affairs.

Why it matters: 52% of Americans said the Trump administration's decision to kill Iranian Gen. Qasem Soleimani in an airstrike makes them feel "less safe," despite assurances from Secretary of State Mike Pompeo and other top officials that the U.S. is safer with Soleimani gone.