In his first major speech, Attorney General Merrick Garland warned the nation Monday to remain vigilant against the rising threat of domestic extremism.

Why it matters: Domestic terrorism poses an "elevated threat" to the nation this year, according to U.S. intelligence. Garland has already pledged to crack down on violence linked to white supremacists and right-wing militia groups.

Get ready for lofty statements, urgent calls for carbon-cutting progress, new pledges — and known unknowns about how much concrete action will follow — at President Biden's global climate summit this week.

What we're watching: The White House will showcase a new 2030 U.S. emissions-cutting target and unveil plans for billions of dollars to help developing nations fight climate change, according to Bloomberg.

Several Democrats on Friday slammed President Biden's decision to not raise the cap on refugees allowed to enter the U.S. this year, calling it "disgraceful" and "utterly unacceptable."

Why it matters: Biden campaigned on the promise to increase the limit, which was set to a historically low figure under the Trump administration.

The U.S. has administered more than 202 million coronavirus vaccine doses since the start of its inoculation campaign, with nearly 4 million vaccinations reported on Friday alone, according to the latest data from the Centers for Disease Control and Prevention.

Why it matters: The numbers indicate Biden is on track to fulfill his promise of 200 million vaccinations within his first 100 days in office. The president set a new goal late last month after it became clear the U.S. was outpacing his initial goal of 100 million doses.

President Biden will sign an order Friday to keep the number of refugee admissions this year at the historically low figure set by the Trump administration, walking back a campaign promise to raise the cap, a senior administration official confirmed to Axios.

Why it matters: Biden has faced mounting pressure to increase the limit as he pledged, with his administration set to accept the lowest number of refugees this year of any modern president, including former President Trump.

The White House announced Friday that the federal government will invest $1.7 billion in funding from the American Rescue Plan to "improve the detection, monitoring, and mitigation" of COVID-19 variants.

Why it matters: New and dangerous virus strains make up half of all cases in America today and risk prolonging the pandemic. Some are more contagious than the original virus.

The family of Tamir Rice, the Black 12-year-old fatally shot by a Cleveland police officer in 2014, is asking President Biden's Justice Department to reopen the federal probe into his death.

Why it matters: Former Officer Timothy Loehmann, who shot and killed Rice, never faced charges. The Rice family's request comes amid outrage over the police killing of Daunte Wright earlier this week, Derek Chauvin's ongoing trial and the release of footage on Thursday showing the police shooting of 13-year-old Adam Toledo in Chicago.

China's Vice Minister of Foreign Affairs Le Yucheng told AP on Friday that China is unlikely to pursue climate proposals beyond its current arsenal, calling it "not very realistic" for a country of 1.4 billion people.

Why it matters: Despite heightened geopolitical tensions, the Biden administration has emphasized the need to partner with China on climate change. Le's comments come as Biden's climate envoy John Kerry is discussing the issue in meetings with Chinese officials in Shanghai.

Despite bold talk from top administration officials, there's little reason to think the Russia sanctions package President Biden announced Thursday will do anything to alter Russian President Vladimir Putin's behavior or calculus.

Why it matters: While it's true some elements of the package — namely, the targeting of Russia's sovereign debt — represent significant punitive measures against Moscow, it leaves plenty of wiggle room for the Russian president.

The Biden administration announced it will sanction dozens of Russian officials and entities, expel 10 diplomats from the U.S., and set new restrictions on buying Russian sovereign debt in response to the massive SolarWinds hack of federal agencies and interference in the 2020 election.

Why it matters: The sweeping acts of retaliation are aimed at imposing heavy economic costs on Russia, after years of sanctions that have failed to deter an increasingly aggressive and authoritarian President Vladimir Putin.