North Korea's leader Kim Jong-un and President Donald Trump at their U.S.-North Korea summit in Singapore in June. Photo: Saul Loeb/AFP/Getty Images

North Korea issued a stern warning to the U.S. on Sunday about its latest round of sanctions on officials in Pyongyang, cautioning that continued escalation could "block the path to denuclearization on the Korean peninsula forever" and lead "relations back to the status of last year which was marked by exchanges of fire," BBC reports.

Background: Since President Trump’s June summit with North Korean leader Kim Jong-un, denuclearization efforts have been slow, and the Trump administration has sanctioned North Koreans engaging in illegal activities like cyberattacks and money laundering. The latest round of sanctions came last week, when the Treasury Department sanctioned three of Kim's top aides over "serious human rights abuses and censorship."

Go deeper: We're still relying on Trump-Kim chemistry to prevent nuclear war

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Biden confidants see VP choices narrowing to Harris and Rice

Photos: Tom Williams/CQ-Roll Call, Inc via Getty Images; Win McNamee/Getty Images

Confidants of Joe Biden believe his choices for vice president have narrowed to Sen. Kamala Harris and Susan Rice — and would be surprised if he picks anyone else.

The state of play: This is a snapshot of the nearly unanimous read that we get from more than a dozen people close to him.

An election like no other

Illustration: Eniola Odetunde/Axios

The coronavirus will make the 2020 presidential election different from any in modern history: Voting that begins earlier, results that take longer, mail carriers as virtual poll workers and October Surprises that pop in September.

The big picture: Perhaps 80 million Americans will vote early, by mail or in person, Tom Bonier, CEO of TargetSmart, a Democratic political data firm, tells Axios. That's going to set up more of an Election Season than an Election Day — and increase the odds of national turmoil over the vote count.

Exclusive: Inside McCarthy's new GOP messaging platform

House GOP Leader Kevin McCarthy (R-Calif.). Photo: Tasos Katopodis/Getty Images

House Republican Leader Kevin McCarthy (R-Calif.) has given his GOP colleagues new marching orders for stump speeches between now and November, as incumbents worry about how President Trump's own challenges may strain their re-election bids.

Driving the news: McCarthy delivered a PowerPoint presentation to the GOP conference in person last Thursday at the Capitol Visitor Center, with several members joining via Zoom, lawmakers and aides familiar with the gathering tell Axios.