Here is the latest Iowa news from The Associated Press

NORTH LIBERTY, Iowa (AP) — The Iowa caucus is just around the corner and candidates are heating up the criticism. Joe Biden didn’t name Bernie Sanders, but he told voters in Waterloo, Iowa, on Saturday that he wondered why some candidates don’t know how much their proposals will cost. The youngest of the Democrats, 38-year-old Pete Buttigieg, says this is no time for taking the risk of meeting a new challenge with a familiar playbook. Meanwhile, the Des Moines Register has decided to pull results of its final poll because of a problem with its survey questioning.

DES MOINES, Iowa (AP) — Democratic presidential candidate Andrew Yang says he will “shock” the nation with his performance in Monday night’s caucuses. He says one reason will be his support from Republicans, who he claims back him because he’s focused on the same issues as President Donald Trump. Speaking at a rally at a downtown Des Moines hotel Saturday night, Yang told a packed ballroom that he’s laser-focused on solving the same problems that Trump pointed out — but has actual solutions that people will see and feel.

CEDAR RAPIDS, Iowa (AP) — Sen. Bernie Sanders’ campaign is showing signs of strength heading into Monday’s Iowa caucuses – and a source of tension at its heart. Sanders’ more strident supporters tend to demand that everyone unite behind the Vermont senator if he’s the Democratic nominee but are less forceful in pledging to back the nominee if it’s not him. Sanders himself is trying to tamp down that divide, insisting Saturday in Iowa that his campaign will support the nominee and that he expects others to do the same. If Sanders achieves unity by compromising on stands he has taken for decades in political office, he could disappoint supporters.

FORT MADISON, Iowa (AP) — Some former Democratic presidential candidates could still win votes and make an impact on Iowa’s caucuses Monday. The caucuses essentially allow voters to express support for two candidates in two rounds of voting. During the first round, voters can show support for anyone they want, even if that person isn’t running for president. Some Iowa supporters of former candidates Cory Booker and Kamala Harris say they plan to support the senators during the first round of the caucuses, even though Booker and Harris have bowed out of the race. But they also say the gambit is an attempt to blunt Bernie Sanders’ momentum on the second round.