Pollster Mallory Newall said Monday that suburban women will be a key indicator in how Tuesday's midterm elections go as Republicans and Democrats grapple for control of Congress.

"I think suburban women are going to be a really key indicator into what we see tomorrow night," Newall, research director at Ipsos Public Affairs, told Hill.TV's Joe Concha on "What America's Thinking."

"That's because a lot of these toss-up districts are located in suburban areas throughout the country. They're districts that perhaps a Republican won at the House level, but Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE took in 2016," she continued.

"What you're going to be watching is suburban, college-educated women, and I would expect to see a pretty large gender gap when you look at that group compared to men," she said.

Suburban women, once a Republican voting bloc, have shifted to the left in the wake of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE taking office, according to some experts.

A new Axios/Survey Monkey poll found that 65 percent of white, suburban women have an unfavorable view of Trump.

Women also appear to be headed to the polls en masse ahead of the midterms.

CNN reported on Monday that women are outpacing men in various states, according to data provided by Catilist.

The firm, which works with Democrats, also found that women lead men in early voting in Georgia, Florida, Kansas, and New Jersey.

— Julia Manchester