Sen. Elizabeth Warren says she will seek the presidency in 2020  —  CAMBRIDGE, Mass. — Sen. Elizabeth Warren jumped into the 2020 presidential campaign Monday, offering a message of economic populism as she became the best-known Democratic candidate yet to enter what is expected to be a crowded race.

American Paul Whelan arrested in Russia on spy charges as potential retribution for Maria Butina  —  Russia has arrested an American citizen in Moscow for alleged espionage, according to the country's security services, the FSB.  —  “On December 28, 2018, staff members of the Russian Federal …

Trump says he ‘NEVER ABANDONED’ the idea of a concrete wall, disputing Kelly  —  President Trump on Monday disputed an assertion by his outgoing chief of staff, John F. Kelly, that the White House has abandoned plans for a solid concrete border wall, writing on Twitter that the idea was “NEVER ABANDONED.”

EXCLUSIVE: NYS Senate Dems say thanks, but no thanks to Simcha Felder's return to Democratic conference … ALBANY — Thanks, but no thanks.  —  As they prepare to take over the majority, state Senate Democrats say Brooklyn Sen. Simcha Felder will not be welcomed back into their conference.

C.I.A.'s Afghan Forces Leave a Trail of Abuse and Anger  —  The fighters hold the line in the war's toughest spots, but officials say their brutal tactics are terrorizing the public and undermining the U.S. mission.  —  NADER SHAH KOT, Afghanistan — Razo Khan woke up suddenly to the sight …

Dozens of journalists were murdered in 2018.  This is a crisis of press freedom.  —  THE DEBATE triggered by the murder of Saudi journalist Jamal Khashoggi was exceptional in part because, by some measures, his case was not unusual.  The Post contributing columnist, who was assaulted …

Our Exhausted American Mediocracy  —  The unlikely 2016 election of Donald Trump—the first president without either prior political or military office—was a repudiation of the American “aristocracy.”  By “rule of the best” I mean the ancien régime was no longer understood to suggest wealth and birth …

Bernie alumni seek meeting to address ‘sexual violence’ on '16 campaign  —  More than two dozen women and men who worked on Bernie Sanders' 2016 presidential campaign are seeking a meeting with the senator and his top political advisers to “discuss the issue of sexual violence and harassment …

I Was A Cable Guy.  I Saw The Worst Of America.  —  A glimpse of the suburban grotesque, featuring Russian mobsters, Fox News rage addicts, a caged man in a sex dungeon, and Dick Cheney.  —  I can't tell you about a specific day as a cable tech.  I can't tell you my first customer was a cat hoarder.

House Democrats ready strategy to reopen government, deny Trump wall money  —  Democrats have settled upon a strategy for attempting to reopen the government when they take control of the House Thursday.  —  Democrats plan to pass a stopgap spending bill to fund the Homeland Security Department through Feb. 8.

GOP candidate kept corporate donations despite requests to return them, filings show  —  Despite calls for refunds, new campaign filings show Mississippi Sen. Cindy Hyde-Smith kept $50,000 in donations from major companies like Walmart and Facebook in the wake of her controversial special election victory in November.

Louis C.K. — Goes After Parkland Victims ... In Leaked Audio of New Stand-Up  —  As if Louis C.K. hadn't already hit bottom, he just went even lower by attacking victims of the Parkland massacre in a stand-up set ... this according to leaked audio of his new material.

The Story of 2018 Was Climate Change  —  Future generations may ask why we were distracted by lesser matters.  —  Our best hope may be the weather.  —  For a long time, many people thought that it was a mistake to use the weather as evidence of climate change.  Weather patterns contain a lot of randomness.

Trade deal unlikely under May's Brexit deal, US envoy warns UK  —  The U.K. will likely miss out on a HUGE Donald Trump-style trade deal if Prime Minister Theresa May wins parliamentary approval for her Brexit, the U.S. ambassador to Britain warned Monday.  —  Ambassador Woody Johnson …

Trump Digs In, Darkening Hopes for a Deal to End the Shutdown  — The president has repeatedly called allies, reassuring them that he will not yield on his wall demands.  — But nine days into a partial government shutdown, Mr. Trump has not reached out to Democrats, whose votes he needs for a deal.

Kellyanne Conway Busted In Florida After She Criticized Pelosi For Hawaii Visit During Shutdown  —  Kellyanne Conway criticized incoming Speaker of the House Nancy Pelosi for being in Hawaii during the government shutdown, while Conway was in Florida apparently for Trump's New Year's Eve party.

The Media's Post-Advertising Future Is Also Its Past  —  It's my holiday tradition to bring tidings of discomfort and sorrow to my colleagues in the news business.  One year ago, I described the media apocalypse coming for both digital upstarts and legacy brands.

Suspect's Twitter messages played role in NSA hacking-tools leak probe  —  Hours before a 2016 leak of some of the National Security Agency's most closely guarded hacking tools, a former NSA contractor sent a cryptic Twitter message that prompted alarm on the part of federal investigators, a federal judge has revealed.

Shutdown Symbolism  —  $5 billion is a pittance in the budget, but blocking it would keep Trump from fulfilling his main campaign promise — and threaten his reelection.  —  This year, the United States government will have spent more than $4 trillion.  Right now, the government is shut …

Cleaning the Congressional Stables  —  The House Democratic class of '19 is planning a major push on voting, ethics and campaign finance reform.  All that stands in the way is the Senate.  —  The editorial board represents the opinions of the board, its editor and the publisher.