“The House Democratic managers argue the Senate must ‘eliminate the threat that the President poses to America’s national security’ in the 111-page legal brief they filed Saturday,” the Washington Post reports.

The brief also describes Trump’s conduct as “the Framers’ worst nightmare”

“With opening arguments in the Senate trial to begin Tuesday afternoon, the seven House managers had until 5 p.m. Saturday to file their brief describing why Trump should be convicted and removed from office. The White House defense team has until noon Monday to file its argument why he should be acquited.”

Des Moines Register: “Iowa Senate Democratic Leader Janet Petersen is endorsing Elizabeth Warren for president, moving off the sidelines in the final weeks of the caucus cycle after previously saying she did not plan to endorse anyone.”

Politico: “The ‘Never Trump’ movement had once hoped to embarrass President Donald Trump in 2020 with a primary challenge that would expose the president’s weaknesses within his own party. But Trump’s GOP opponents are failing to even get on the ballot in many states, let alone gain traction with Republican voters.”

“With the start of primary season just weeks away, Trump rivals Joe Walsh and Bill Weld are ceding an array of key battlegrounds. Walsh won’t be competing in more than half of the 30 states and territories whose filing deadlines have already passed, while Weld won’t be contending 12 of them. The latest blow came Wednesday, when the two missed the deadline to make the Virginia ballot, making Trump the sole contender.”

“In the final weeks before the Iowa caucuses, the two leading female candidates remaining in the Democratic primary are embracing their gender as an asset, decisively pushing back against concerns that a woman can’t be elected president,” the New York Times reports.

“Yet, the sisterhood may stop before the White House. In interviews with nearly two dozen female voters in Iowa this week, the symbolism of breaking what Hillary Clinton called ‘that highest, hardest glass ceiling’ in politics seemed to be less resonant than ever before, particularly for older voters, who were subsumed by anxiety about defeating Mr. Trump.”

“Pete Buttigieg is not touching the he-said-she-said between two of his chief primary rivals. In fact, he’s going to great lengths not to talk about any opponents at all, after spending the fall drawing contrasts with them,” Politico reports.

“Instead, Buttigieg, who has dropped 5 to 7 points in the polling averages here in a few months, is trying to regain the first-place position he once held in Iowa, closing out on a message of party unity. He’s staying outside of the conversation dominating cable news, campaigning miles away from the impeachment proceedings that called his opponents in the Senate away to jury duty.”

“The presidential campaign of Sen. Bernie Sanders has researched the question of whether the same person can serve as both vice president and treasury secretary,” The Intercept reports.

“The person the Sanders campaign had in mind with the inquiry was Sen. Elizabeth Warren, his rival for the nomination and the bane of Wall Street over the last decade.”

“The answer the lawyers came back with was yes: There is nothing in the Constitution that bars the vice president from also serving as treasury secretary.”