Primary voting in Puerto Rico has been partially suspended due to a lack of ballots at voting centers, AP reports.

Why it matters: Most primaries in the U.S. have been forced to reschedule due to the coronavirus, but not because of a logistical issue. The incident has sparked calls for the territory's election commission to resign and could foreshadow more election problems to come in the territory's November general election.

1. Global: Total confirmed cases as of 4 p.m. ET: 19,720,406 — Total deaths: 728,176 — Total recoveries — 11,970,444 — Map.
2. U.S.: Total confirmed cases as of 4 p.m. ET: 5,032,299 — Total deaths: 162,751 — Total recoveries: 1,643,118 — Total tests: 61,080,587 — Map.
3. Politics: Pelosi says states don't have the funds to comply with Trump's executive order on unemployment — Mnuchin says Trump executive orders were cleared by Justice Department.
4. Public health: Ex-FDA head: U.S. will "definitely" see 200,000 to 300,000 virus deaths by end of 2020 — Fauci says chances are "not great" that COVID-19 vaccine will be 98% effective.
5. Schools: Nine test positive at Georgia school where photo showing packed hallway went viral — How back-to-school is playing out in the South as coronavirus rages on.

Joe Biden leads President Trump 48% to 42% in Wisconsin and 49% to 43% in Pennsylvania, according to the latest CBS/YouGov Battleground Tracker poll.

Why it matters: Trump's surprise wins in the two states, where many voters broke his way after deciding the week before the election, helped propel him to an Electoral College victory over Hillary Clinton. Trump won Wisconsin with 47% of the vote and Pennsylvania with 48% in 2016, according to the New York Times.

President Trump's promise to make permanent cuts to payroll taxes if re-elected will deplete the Social Security and Medicare trust funds they finance, Senate Minority Leader Chuck Schumer (D-N.Y.) said Sunday on ABC's "This Week".

Driving the news: President Trump Saturday signed an executive order deferring payroll taxes for Americans earning less than $100,000 a year, and floated eliminating the tax altogether for those Americans if he is re-elected. It's unclear if Trump has the authority to suspend payroll taxes by executive action.

Sen. Richard Blumenthal (D- Conn.) called on the Trump administration to declassify intelligence detailing Russian efforts to influence the 2020 elections, telling MSNBC on Sunday that the classified briefing lawmakers received about the Kremlin's activities last week was "absolutely chilling."

The big picture: National Counterintelligence and Security Center Director William Evanina said in a statement Friday that the Russian government is "using a range of measures" to "denigrate" Joe Biden ahead of the election. China and Iran would prefer that Trump is defeated, according to Evanina.

White House trade adviser Peter Navarro defended President Trump on Sunday for spending the weekend at his golf club in New Jersey and signing executive orders in the absence of a congressional deal on coronavirus aid, calling him the "hardest-working president in history."

Why it matters: Trump has received bipartisan pushback and allegations of executive overreach for the orders, which include an extension of extra unemployment benefits. Democratic leaders have called for Republicans to return to the table and compromise, but there remains a trillion-dollar gap in the size of the package that each side is seeking.

Treasury Secretary Steven Mnuchin insisted on "Fox News Sunday" that President Trump's executive orders on coronavirus aid were cleared by the Justice Department's Office of Legal Counsel, and said that Democrats are going to "have a lot of explaining to do" if they choose to challenge them in court.

Why it matters: Democrats and even some Republicans have criticized Trump's decision to circumvent Congress to extend unemployment benefits as executive overreach, given that the Constitution gives Congress power to appropriate spending.

Sen. Ben Sasse (R-Neb.) has dialed up his spicy slams of President Trump, including this swipe at yesterday's signing ceremony: "The pen-and-phone theory of executive lawmaking is unconstitutional slop."

Why it matters: Trump increasingly looks — to business and to fellow Republicans — like a loser in November. So they're more likely to create distance to save their own skins. Sasse also won his May primary, further freeing him.

House Speaker Nancy Pelosi claimed on "Fox News Sunday" that states don't have the funds to comply with the executive order President Trump signed on Saturday, which requires them to cover 25% of an additional $400 in weekly unemployment benefits.

Why it matters: Many state and local governments have had their budgets devastated by the economic impacts of the coronavirus, which have caused expenses to soar and revenues to plunge.

House Speaker Nancy Pelosi said on CNN's "State of the Union" Sunday that the threats posed by China and Russia to U.S. elections are "not equivalent," stressing that "Russia is actively, 24/7, interfering in our election."

Why it matters: Top counterintelligence official William Evanina revealed in a statement on Friday that the Russian government is "using a range of measures" to "denigrate" Joe Biden ahead of the election. The government of China, meanwhile, prefers that Trump does not win re-election, Evanina said.

White House economic adviser Larry Kudlow said on CNN's "State of the Union" Sunday that he regrets suggesting this week that unemployment benefits can only be extended by Congress.

Why it matters: President Trump's decision to bypass Congress to sign four executive actions, including one that provides $400 per week in extra unemployment benefits, has prompted outcry from Democrats and even some Republicans who believe he is overstepping his constitutional authority.

Police declared a riot in Portland late Saturday after protesters broke into a police union building and set a fire, AP reports.

Why it matters: Violent demonstrations have continued in the city more than 70 days after nationwide protests began over the police killing of George Floyd. They have persisted despite the withdrawal of federal agents, who have been accused of escalating the violence in Portland.

Ohio Gov. Mike DeWine (R) tested negative for COVID-19 for a second time after initially testing positive last week, he announced Saturday.

Why it matters: 73-year-old DeWine was set to meet President Trump Thursday on the tarmac at an airport in Cleveland and was tested as part of standard protocol.

Some Republicans joined Democrats in criticizing President Trump Saturday night for taking executive action on coronavirus aid, with Democratic leaders demanding the GOP return to negotiations after stimulus package talks broke down a day earlier.

Why it matters: Trump could face legal challenges on his ability to act without congressional approval, where the constitutional power lies on federal spending. Sen. Ben Sasse (R-Neb.) was the most vocal Republican critic, saying in a statement: "The pen-and-phone theory of executive lawmaking is unconstitutional slop."