Battle for Iowa caucus intensifying just 22 days away

A major shift in the polls indicates Sen. Bernie Sanders has the momentum with a four-way race with Elizabeth Warren, Pete Buttigieg and Joe Biden.
2:41 | 01/13/20

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Transcript for Battle for Iowa caucus intensifying just 22 days away
Now to the 2020 election and 22 days until the Iowa caucus. The latest shift in the polls indicating Bernie Sanders with the momentum leading a four-way race with Elizabeth Warren, Pete buttigieg and Joe Biden. Senator Warren taking aim at her opponents as they all jockey for position. ABC's Rachel Scott in Iowa tonight. Fight hard and win. Reporter: Tonight senator Elizabeth Warren packing the house and sharpening her attacks. Senator Bern Sanders is heading into this critical stretch with a slight edge on the rest of the pack in the latest state poll. Warren who was also courting Progressive voters saying Sanders needs to take his campaign in a "Different direction" after a report his volunteers were given talking points saying Warren supporters were more after fluent and would vote for any Democrat. I was disappointed to hear that Bernie is sending his volunteers out to trash me. We cannot nominate someone who takes big chunks of the democratic coalition for granted. Reporter: Sanders pushing back saying he never approved of that message. People sometimes say things that they shouldn't. You have heard me give many speeches. Have I ever said one negative word about Elizabeth Warren? Reporter: Warren also going after former New York City mayor Michael Bloomberg, who is skipping the state entirely. The next president of the United States, Michael Bloomberg. Reporter: Instead campaigning this weekend in Texas with TV's judge Judy. Judy, thank you, and hello, Austin. I am running to defeat Donald Trump. Reporter: Warren calling on Bloomberg to release nondisclosure agreements from employees who settled with his company over hostile work environment complaints. What is it that Michael Bloomberg has to hide? Reporter: Bloomberg will not be on the next debate stage and neither will Andrew yang, who failed to qualify. Screw Iowa! No, I'm kidding! Kidding! Reporter: Yang said he was kidding, but the battle for Iowa is intensifying, the caucus just 22 days away. Rachel Scott joins us now live from Des Moines and, Rachel, Bloomberg focusing on states that vote super Tuesday and signaling this weekend just how much he'd be willing to spend to defeat president trump? Reporter: That's right. Tom, and Bloomberg has already taken heat from his rivals over how much money he is already spending in the race. Senator Elizabeth Warren says he's skipping out on the democracy part of this primary but Bloomberg says he is open to spending $1 billion by election day even if he's not the eventual nominee. He plans on building out a robust operation to help his party in its fight against president trump. Tom. Rachel Scott for us from de Des Moines where the snow is coming down. Rachel, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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