Here is the latest Iowa news from The Associated Press at 3:40 a.m. CST

WASHINGTON (AP) — Today (Tuesday) marks the last time the leading Democratic presidential contenders will face a national audience on the debate stage before primary voting begins, making it the most significant moment of the 2020 primary season to date. The prime-time faceoff comes just 20 days before Iowa’s caucuses as polls suggest the nomination is truly up for grabs. Heading in, there are new signs of tension among all the top-tier candidates, particularly Bernie Sanders and Elizabeth Warren. If ever there has been a time for the six contenders on stage to take the gloves off, this is it.

WASHINGTON (AP) — A new dispute between Elizabeth Warren and Bernie Sanders marks a significant turning point in a Democratic primary that has generally been characterized by genial differences over policy. On Monday, Warren said Sanders told her during a private meeting two years ago that he didn’t think a woman could win the White House. Sanders has denied telling Warren that, and a senior Sanders adviser says that “those conversations can sometimes get misconstrued.” The feud brewing between Warren and Sanders will likely change the tone of the campaign going into Tuesday’s debate.

DES MOINES, Iowa (AP) — President Donald Trump will be holding a rally in Iowa just days before the state holds its election kickoff caucuses. Trump’s reelection campaign announced Monday that he will be rallying supporters in Des Moines on Jan. 30. That’s four days before the contest for the Democratic nomination formally gets underway. It’s one of a series of events in states across the country that will keep Trump in the spotlight and give him a platform to make his case directly to voters as the impeachment case against him heads toward the Senate.

DES MOINES, Iowa (AP) — Presidential candidates have swarmed Iowa’s rolling landscape for more than a year, making their pitch to potential supporters on college campuses, county fairgrounds and in high school gymnasiums. But three weeks before the caucuses usher in the Democratic contest, the battle for the state is wide open. A cluster of candidates, including Bernie Sanders and Elizabeth Warren, along with Joe Biden and Pete Buttigieg, enters the final stretch with a plausible chance of winning Iowa’s caucuses. A poll released Friday by The Des Moines Register and CNN found them all with similar levels of support.