Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) voiced his frustration over long lines at Michigan polling places and urged officials to extend the hours for voting if necessary in the state’s crucial primary.

Michigan is one of six states to vote on Tuesday, and Sanders's tweet comes amid reports of long lines at some polling stations in the state and wait times that were stretching into hours.

“At a time when Democrats correctly attack Republicans for voter suppression, it is disappointing to see people standing in long lines for hours today waiting to vote in Michigan and around the country. People should not have to miss a day of work to exercise their right to vote. This is an outrage,” Sanders said in a statement.

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“Election officials must address these problems immediately, and if necessary, keep polling places open longer,” he added.

Sanders is facing a must-win contest in Michigan to arrest the momentum of former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE. Most polls in the state were set to close at 8 p.m. ET.

By 8:10 p.m. ET, Biden was projected to win Mississippi and Missouri.

Abshir Omar, the Sanders campaign’s Michigan political director, tweeted the story of a Michigan State University student who was forced to forgo voting and head to work after waiting in line for an hour.

A Michigan State University student after waiting over an hour in line to vote, called it quits and walked out. He said “this is bullshit, I can’t wait this long, I have to get to work.”@MichSoS, this is unacceptable. #MichiganPrimary #YouthVote2020 — Abshir Omar (@AbshirDSM) March 10, 2020

The Detroit Free Press also reported that a line to register to vote at the East Lansing City Clerk’s Office stretched around the building and consisted mostly of college students, a key constituency the Sanders campaign is hoping votes in droves.

Sanders narrowly won the Michigan primary in a 2016 upset over Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE. Polls heading into primary day showed Biden with a wide lead over Sanders.